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| | Photographing the Moon |
 | | When the luminance of the sky is three steps less than that of the moon, the increase in moon luminance from the skylight is only 1/6 step, and can be ignored. | | | But it’s usually easier to choose a time when the luminance of the moon and that of the foreground are reasonably balanced. | | | Knowing the luminance in EV of two different scene elements also makes it easy to determine the contrast. |
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http://www.calphoto.com/moon.htm
(2472 words)
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| | Section 2: Luminance, Luminance, Luminance! |
| | The Luminance rules might seem to be an enormous creative constraint, but the rules actually make it easier to test your color combinations for visibility problems in a scientific and consistent way. | | | Luminance Rule 2: Having the foreground objects presented in color while using a monochrome background, or any other combination* of color and black and white, does not allow you to avoid Luminance Rule 1. | | | Not only can you not evade the Luminance rules by using color foreground components (like fonts), one or more Chrominance rules also come into play when color text is used or multiple colors are used adjacent to one another. |
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http://nemesis.lonestar.org/reference/internet/web/color/luminance.html
(2062 words)
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| | Histograms Tutorial - Luminance and Color |
| | Luminance takes into account the fact that the human eye is more sensitive to green light than red or blue light. | | | As a rule of thumb, the more intense and pure the colors are in your image, the more a luminance and RGB histogram will differ. | | | On the other hand, the luminance histogram accurately tells us that no pixel is anywhere near full black or white. |
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http://www.cambridgeincolour.com/tutorials/histograms2.htm
(960 words)
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| | More details about Luminance in Histograms |
| | Blue should also have the lowest luminance (closest to the left or zero or black end). | | | There are other variations of this formula also used, with slightly different numbers, but this one is fine to make our point here. | | | The Green is brighter than Blue or Red, even when mixed with Red or Blue. |
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http://www.scantips.com/lumin.html
(1429 words)
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| | Luminance and Chromaticity |
| | where Y is the luminance of the patch and Yn is the luminance of a perfect diffuse reflector (ideal white patch). | | | Any two of these (conventionally x and y are used) plus the luminance, Y, fully capture the standard observer's color match to the test light. | | | Chromaticity diagrams show two of the three dimensions of color, the third being luminance. |
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http://colorusage.arc.nasa.gov/lum_and_chrom.php
(1743 words)
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| | Temporal binding from synchronous luminance changes |
| | To do this, we needed to devise a stimulus in which only the synchrony of luminance changes was relevant (not the synchrony of temporal transients), and we also needed to rule out the use of constant luminance cues. | | | Thus, a luminance cue is, theoretically, always available to the observer. | | | Recall, though, that one of our goals was to rule out the use of a constant luminance cue. |
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http://www.psych.utoronto.ca/~vislab/absARVO
(1975 words)
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| | Luminance Contrast Color Guidelines |
| | The black line has higher luminance contrast with the background and can be read (it would be even easier to read with a brighter green). | | | In order for a display to appear white when all three primaries are at their maxima the blue primary must have only about 1/10 the luminance of the green primary. | | | In spite of the large chromatic contrasts between the lines of text and the green background none is very legible at the point where the text and background luminances are equal. |
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http://colorusage.arc.nasa.gov/guidelines_lum_cont.php
(848 words)
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| | SID Article - Brightness, Luminance, and Confusion |
| | Measuring the luminance of the light from that point is straightforward and highly repeatable We can go a step further and take a second measurement at a different point on the screen. | | | Tilt the flashlight and the illuminated spot increases in area and becomes elliptical in shape. | | | We can then calculate the contrast between the two points. |
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http://www.crompton.com/wa3dsp/light/lumin.html
(2525 words)
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| | Midterm Exam 1 Review Spring 2003: Check your luminance |
| | def checkLuminance(pict): for px in getPixels(pict): newRed = getRed(px) * 0.299 newGreen = getGreen(px) * 0.587 newBlue = getBlue(px) 0.114 luminance = newRed+newGreen+newBlue setColor(px,makeColor(luminance,luminance,luminance)) if luminance | | | def checkLuminance(r, g, b): newRed = int(r*.299) newGreen = int(g*.587) newBlue = int(b*.114) luminance = newRed + newBlue + newGreen if luminance < 10: print "That's going to be awfully dark" if luminance>50 and luminance < 200: print "Looks like a good range" if luminance > 250: print "That's going to be nearly white" | | | if luminance >250: print "That's going to be nearly white" |
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http://coweb.cc.gatech.edu/cs1315/199
(658 words)
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| | Perceived And Measured Luminance |
| | Most people would say the green chip on the left is darker than the red chip in the center and the red chip is darker than the blue chip on the right. | | | It is the Input number circled in red. | | | As we can see, the tone for all three is 26, which is Zone I. I call the value given by the Curves control the measured luminance. |
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http://www.zuberphotographics.com/page_TMSPerceivedLuminance.htm
(543 words)
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| | Midterm Exam 1 Review Spring 2004: Check your luminance |
| | so is this what you want?-- def checkLuminance(red, green, blue): redvalue=red*0.299 greenvalue=green*0.587 bluevalue=blue*0.114 luminance=redvalue+greenvalue+bluevalue if luminance | | | this is what i have def checkLuminance(picture, red, green, blue): for p in getPixels(picture): newRed=getRed(p)*0.299 newGreen=getGreen(p)*0.587 newBlue=getBlue(p)0.114 luminance=newRed+newGreen+newBlue setColor=(p, makeColor(luminance,luminance,luminance) if luminance | | | def checkLuminance(picture): for px in getPixels(picture): newRed = getRed(px)*0.299 newGreen = getGreen(px)*0.587 newBlue = getBlue(px)* 0.114 luminance = newRed+newGreen+newBlue print luminance if luminance |
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http://coweb.cc.gatech.edu/cs1315/1383
(790 words)
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| | Green Building Encyclopedia - Glossary of Green Building Terms |
| | Unit of luminance equal to one candela per square meter. | | | The baffles are usually arranged in a geometric pattern. | | | An enclosure that simulates the luminance distribution of a real sky for the purpose of testing physical daylighting models (e.g., a hemispherical-dome or mirror-box artificial sky). |
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http://www.whygreenbuildings.com/glossary.php
(6282 words)
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| | Untitled Document |
| | Go the layers dialog box (if the menu box is not visible then go to "windows" and click | | | Close out the empty window that once held your luminosity. | | | You will see that there are now two layers; your RGB image which is now the "background" layer and the luminance which is now "layer 1". |
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http://www.robgendlerastropics.com/LRGB.html
(1904 words)
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| | ~Luminance Frame~ |
| | Go to layer 2 and change the blend mode to Luminance. | | | Now go to effects/3d effects/drop shadow and apply the settings shown below: | | | The corner gold is the only ones you do not have to change the luminance on as I already did those for you. |
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http://allytoy.addr.com/Main/tutorials/lumframetut/lumframetut.html
(725 words)
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| | Vision Series - darksky.org |
| | Each color is a different wavelength, allowing them to contain various luminous properties. | | | Luminance vision is the most basic type of vision in that without it our sense of the world would be flat or 2-d rather than 3-d. | | | One way to figure out how much luminance is attributed to a certain color is by turning a picture into grayscale. |
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http://www.darksky.org/VisionSeries/vs3-3.html
(402 words)
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| | Astro > Articles > Luminance from a Toucam ( DNN 2.1.2 ) |
| | By restacking the same set of frames that we used to stack the full RGB data set for only the Y channel, we get a real luminance layer. | | | The format is known as i420, which is a variant of the YUV codec. | | | Deep sky astrophotographers have been using a luminance layer in their photos for a long time now. |
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http://www.astrogarage.com/Default.aspx?tabid=311
(711 words)
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| | Luminance Channel |
| | So you can see that luminance takes into account two major factors: 1. | | | The term luminance is defined by the CIE. | | | This is the pathway that goes through the magnocellular layers of the lateral geniculate nucleus (LGN). |
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http://www.yorku.ca/eye/luminanc.htm
(218 words)
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| | Luminance Inc. - The Performance Improvement Company - Endorsements |
| | You know how to put the point across, how to make sense of things, and you keep the interest of your audience.” | | | Luminance's "Working With Teams" program helped us address some difficult problem areas. | | | Working with Luminance allowed us to develop world class training materials that we’ve been proud to show others.” |
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http://www.luminance.net/endorsements.htm
(238 words)
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| | Errors due to nonconstant luminance |
| | In addition, you can access two technical notes (in progress), in Acrobat PDF format, roughly 90 KBytes each: | | | In other words, the correct luminance coefficients are used, but in the wrong equation! | | | It has not been shown that using the "theoretically correct" coefficients delivers any practical advantage, but there is a huge advantage in maintaining a single standard set of luma coefficients. |
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http://www.poynton.com/notes/video/Luma_coefficients
(415 words)
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| | VN Boards - Luminance |
| | [AC Vault] VN Boards » Asheron's Call Server Boards » Thistledown » Luminance Join Insider | | | She seemed to be grabbing a few more items than usual. | | | IGN's enterprise databases running Oracle, SQL and MySQL are professionally monitored and managed by Pythian Remote DBA. |
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http://vnboards.ign.com/Message.aspx?topic=80103685
(523 words)
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| | Luminance - definition of Luminance in Encyclopedia |
| | As applied to analog television signals, two different words are used, luminance and luma, meaning two different things. | | | Luma is a new word proposed by the NTSC in 1953 to prevent confusion between the Y' component of a color signal and the traditional meaning of luminance. | | | The word luminance, a synonym for luminosity, means emitting or reflecting light. |
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http://encyclopedia.laborlawtalk.com/Luminance
(145 words)
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| | Luminance |
| | The luminance is usually meant by letter Y=Lum(color) and: | | | In physics the notion of luminance is defined as a measure of the intensity of shining of sources or surfaces reflecting light according to the fixed measuring conditions. | | | In such case the light Brightness is the measuring pattern. |
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http://semmix.pl/color/models/emo175.htm
(354 words)
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| | [No title] |
| | Result and discussion: Some correct ratios are not so high, however luminance and chromaticity of test stimuli are completely same. | | | Method: Same as Exp.1, though one of the test stimuli has same luminance and different chromaticity, and vice versa. | | | Method: A small disk that moved linearly was presented on a computer display (standard stimulus). |
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http://www.iscc.org/aic2001/abstracts/poster/Sakata.doc
(865 words)
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| | Luminance Looming |
| | The effect may also be stronger when observed with one eye only. | | | For each disk the following rule holds: In the looming phase the luminance increases in small steps, and after the maximum value it drops to black (preferentially stimulating the off-system. | | | The neighbouring figure is comprised of disks whose luminance changes over time in a sawtooth manner. |
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http://www.michaelbach.de/ot/sze_lumiloom
(231 words)
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| | Face-Based Luminance Matching Software |
| | The second one is the result of luminance-controlled interpolation (based on gamma) between the control points. | | | This software implements all the steps needed to generate colormaps with pretermined patterns of luminance variation, including monotonically increasing luminance, and isoluminance. | | | : Simple stand-alone program for experimenting with face-based luminance matching to see how it works on different colors. |
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http://www.cs.utah.edu/~gk/lumFace
(569 words)
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| | Dimension of Color: Luminance |
| | Behaviour: As luminance increases, the planes of color move from black to white. | | | This quality of color is tightly related to value but creates a different shape within the same color space. | | | Chroma - Hue - Luminance - Saturation - Value - RGB/CMY |
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http://www.colorcube.com/software/docss/luminance.htm
(220 words)
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| | Face-based Luminance Matching for Perceptual Colormap Generation |
| | However, the luminance component of perceptually based colormaps should be controlled, due to the central role that luminance plays in our visual processing. | | | That is, the relationship between RGB input levels and perceived luminance is usually not known, due to variations in the monitor, hardware configuration, and the viewing environment. | | | Normally I would think it better to read the paper than view an online version of the talk, but in this case I think the talk explains things more clearly than the paper does. |
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http://www.cs.utah.edu/~gk/papers/vis02
(199 words)
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| | Brightness as a Function of Luminance |
| | Note that two images with different luminance values can have the same brightness values, and appear to be the same. | | | That means he tried to match the brightness when one eye is dark adapted (standard condition for brightness measuring) and the other eye is adapted to a test value. | | | and R is the target luminance difference in dB |
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http://www.cg.tuwien.ac.at/research/theses/matkovic/node17.html
(423 words)
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| | Splendid Magazine reviews Marilyn Lerner: Luminance |
| | Luminance is the kind of album that can, with proper exposure, gain converts to the improvisational and experimental side of music. | | | If you're on the fence about whether or not experimental/improvised music is for you, here's a little experiment. | | | Mostly, though, Luminance is notable for its friendliness and inclusiveness. |
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http://www.splendidezine.com/review.html?reviewid=1083664659173297
(535 words)
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| | User Macro Document - luminance |
| | The luminance module computes a scalar luminance function for each pixel in an image from the red, green and blue channels of that color image. | | | Uniform scalar byte field containing the calculated luminance values as unsigned bytes. | | | The output field is the same size of the input in each dimension. |
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http://www.iavsc.org/repository/express/pages/lumi/lumi.shtml
(281 words)
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| | Luminance Project :: Panel |
| | The core of the code was based on the fbpanel, which was in turn based on fspanel. | | | The Luminance Panel is a small panel application written in GTK 2.0. | | | It provides a basic icon menu, a group of panel icons, a taskbar and a clock. |
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http://luminance.sourceforge.net/status_subprojects_panel.php
(78 words)
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| | Luminance Corrected LRGB |
| | This is why I refer to it as "Luminance Corrected LRGB". | | | Simply decreasing the opacity setting of the luminance layer in Photoshop to achieve a luminance "blend" results in greater color saturation, but at the expense of luminance detail (since the luminance contribution that we work so hard to obtain is diluted out by this method). | | | This may be fine for some images, but not others. |
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http://www.starrywonders.com/lumcorrectedlrgb.html
(665 words)
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| | luminance |
| | The term luminance comes from the color space known as YUV. | | | The Y component corresponds to overall brightness, or luminance of a given spot or pixel. | | | The LavaRnd reference implementation only uses the Y component of a CCD frame. |
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http://www.lavarnd.org/faq/luminance.html
(50 words)
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| | Luminance |
| | The luminance signal is formed by combining a proportion of 30% red, 59% green and 11% blue from the colour signal. | | | This combined output becomes the luminance (brightness/ monochrome) signal. | | | It is written as Y. In TV usually derived from the RGB signals originating from a camera or telecine, by a matrix or summation. |
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http://www.screensound.gov.au/glossary.nsf/Pages/Luminance?OpenDocument
(104 words)
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| | Encyclopedia of Cognitive Science: Change Blindness |
| | Within this context, the explanation of change blindness involves two components: a component related to what is called "visual transients", and a component related to the way a scene is encoded in memory. | | | It is known that such transients are detected in the first levels of the visual system, and that attention is automatically attracted to the location where they occur. | | | Visual transients are fast changes in luminance or colour in the retinal image, such as would be produced by a sudden appearance or disappearance, or through motion of an element of the scene. |
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http://nivea.psycho.univ-paris5.fr/ECS/ECS-CB.html
(3318 words)
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| | Luminance |
| | That is how Luminance has helped shed some light on projects by... | | | Enabling creators since 2000, Luminance offers highly specialized training solutions on various creative software tools. | | | Luminance helps you to master the technology, allowing you to focus on the most important aspect : the creative process. |
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http://www.luminance.ca/home_e.html
(133 words)
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| | Photometry |
| | In the luminous case it is measured in lumens/m | | | The candela is the luminous intensity, in a given direction. |
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http://hyperphysics.phy-astr.gsu.edu/hbase/vision/photom.html
(273 words)
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| | Color Perception |
| | The brightness parameter Y is a measure of luminance, which is light intensity factored by the sensitivity of the normal human eye. |
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http://hyperphysics.phy-astr.gsu.edu/hbase/vision/colper.html
(620 words)
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| | Wordsmyth |
| | the measure of brightness of a light source or a luminous surface in candelas per unit area. |
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http://www.wordsmyth.net/live/home.php?script=search&matchent=luminance&matchtype=exact
(94 words)
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| | Apple - Pro Applications - Training - Books |
| | Topics include: Color and Luminance Basics, FCP’s Videoscopes, Basic and Three-Way Color Correction, Advanced Tips and Techniques. | | | DigitalFilm Tree presents the most comprehensive document covering ‘Professional Color Correction on the desktop.’ The Guide takes you from general color correction theory to Final Cut Pro’s expansive Color Correction capabilities. |
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http://www.apple.com/software/pro/training/books.html
(2531 words)
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| | luminance |
| | the quantitative measure of brightness of a light source or an illuminated surface, equal to luminous flux per unit solid angle emitted per unit projected area of the source or surface. |
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http://www.infoplease.com/dictionary/luminance
(57 words)
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| | Who made this exhibit? What are the sources? |
| | Colorblindness: Detail and data about cones, color matching, luminance functions, and colorblindness genes from a collaborative project of the Color and Vision Research Laboratories at the University of California San Diego and the University of Tübingen. |
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http://webexhibits.org/causesofcolor/credits.html
(2564 words)
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