Photoshop Gamma Error
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What Is Analytic Cubism?
Submit your Photo Hall of Fame Please participate in Meta and help us grow. _ Photography Stack Exchange is a question and answer site for which of the following is not correct regarding the differences between the two images below quizlet professional, enthusiast and amateur photographers. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Is this article which of the following explains why some audiences were not accepting of cubism? correct about gamma error in picture scaling in common software? up vote 5 down vote favorite 1 That is kind of a "please proof-read an articles conclusion"-question. Some time ago I found this page: Gamma error in picture scaling. I grasp the point, that the luminosity-curve is not linear and that some (most) software does assume a linear scale and thus resizes badly. But as I do not have so much experience in the field of image-manipulation / gamma / etc (just starting with the fine points of post-processing), let me ask you: is this guy right about this error during resizing? Is his method to determine erroneous software correct? software resolution gamma rescaling share|improve this question edited Jan 28 '11 at 14:11 mattdm 91.3k29266514 asked Jan 28 '11 at 12:23 Leonidas 2,6911120 The link is to a highly technical article that is less about photography than about algorithms used in photo manipulation software. I'd say this was off-topic. –NickM Jan 28 '11 at 12:57 2 Might be. But resizing is part of my picture-processing. I often batch-resize pictures before giving them out and wonder if this gamma-error a negative impact on them I did not really notice until now. (edit: I even resize for first evaluation, as my screen is only 1920x1080 and I like to evaluate full-picture instead of 100% zoom. So first sorting of pictures itself is impacted.) If the author is right, I'd better have a look into finding alternative SW. –Leonidas Jan 28 '11 at 13:21 add a comment| 3 Answers 3 active oldest votes up vote 3 down vote accepted Before even looking at the article, I say that there certainly is some amount of skew in levels when resizing a JPEG image. This is due to the fact that the RGB values are obtained from the RAW after a gamma (non-linear exponential) correction was applied to the RAW pixel values. Then, while scaling, values from adjace
to blur a really colorful image in Photoshop or Instagram, you end up with a dark, ugly line between colors? We wouldn't see that line in real life, so why does it appear on the computer? MinutePhysics tells us why this dark boundary shows up and explains the mathematics behind color blending on computers: If we were to look at out of focus scenes and images in real life, the colors would blend smoothly into each other. But, for some reason, when a computer tries to http://photo.stackexchange.com/questions/7812/is-this-article-correct-about-gamma-error-in-picture-scaling-in-common-software use transparent edges or blur an image, this really obvious dark boundary creeps in between the colors. Dark bands appear where two colors intersect. This is because of how we perceive brightness. "Our eyes and brains are simply better at detecting small differences in the absolute brightness of dark scenes, and bad at detecting the same differences in bright scenes." http://www.picturecorrect.com/tips/photoshop-computes-color-incorrectly-but-theres-an-easy-fix/ Humans and computers detect brightness differently. Computers, however, don't detect brightness the same way we do. They only count the number of photons hitting a photodetector, so additional photons register the same increase in brightness no matter what the surrounding scene looks like. Basically, when a digital image is stored on a computer, the brightness value of each color at each point of the image is recorded. Zero represents zero brightness and one represents 100% brightness. With this logic, you would think that 0.5 brightness would be half as bright, right in the middle of the two colors, the perfect blend. Well, not so. Take a look at this example. Because of our logarithmic vision, half brightness might look right, but in terms of absolute physical brightness, it has only 1/5 as many photons as white. Back in the early days of digital imaging, in an effort to save disk space, software engineers took advantage of the fact that we are better at detecting small differences in the brightness of dark scenes. I
ElementsAdobe Dreamweaver Adobe MuseAdobe Animate CCAdobe Premiere ProAdobe After EffectsAdobe IllustratorAdobe InDesignView all communitiesExplore Menu beginsMeet the expertsLearn our productsConnect with your peersError: You don't have JavaScript enabled. This tool uses JavaScript and much of it will not work correctly without https://forums.adobe.com/thread/961679 it enabled. Please turn JavaScript back on and reload this page. Please enter a title. You can not post a blank message. Please type your message and try again. More discussions in Photoshop General Discussion All CommunitiesPhotoshop General Discussion 1 2 Previous Next 56 Replies Latest reply on Apr 1, 2012 1:43 PM by Hudechrome Monitor profile is defective Tafflad Feb what is 11, 2012 10:36 AM Every single time I power up CS5 I get an error :"The monitor profile "Samsung - Natural Color Pro 1.0 ICM" appears to be defective. Please rerun your monitor calibration software.No other application complain about this.The monitor is a Samsung SyncMaster 226CWIf I go .. Control Panels \ Color ManagementI can see that there is a profile "Samsung which of the Natural Color Pro 1.0 ICM (default) file SM226CWicmIt is the ONLY profile listed.As per a previous post here ... I followed advice to delete the profile ..I delete it ... I am then prompted to chose a new profile .....from the list shown there is the "Samsung Natural Color Pro 1.0 ICM"I select that.Then next time I start CS ... same error message again.How do I fix this ? 32979Views Tags: none (add) This content has been marked as final. Show 56 replies 1. Re: Monitor profile is defective ssprengel Feb 11, 2012 10:46 AM (in response to Tafflad) Before you delete the profile, click the Add button at the lower-left and scroll down a little ways choose the one with Name: sRGB IEC6196602.1, Filename: sRGB Color Space Profile.icm Then delete the Samsung profile and select the sRGB profile and set it as the default. Like Show 2 Likes(2) Actions 2. Re: Monitor profile is defective Noel Carboni Feb 11, 2012 11:21 AM (in response to ssprengel) Actually, just make the sRGB IEC61966-2.1 profile the (default) using the OS color-management dialog and you