color vision - Printable Version +- Python Forum (https://python-forum.io) +-- Forum: Forum & Off Topic (https://python-forum.io/forum-23.html) +--- Forum: Bar (https://python-forum.io/forum-27.html) +--- Thread: color vision (/thread-38195.html) Pages:
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color vision - Skaperen - Sep-14-2022 when i look at images on my laptop's display (System 76 KuduPro from 2014), they look fine with colors close enough for me. whites look white. when i look at solid white (verified as 0xFFFFFF ... 16777215 decimal) it looks like beige-yellow to me. i have napkin on my desk and it looks white. i suspect if i boost the blue (and a bit of red) to make these solid white areas look white, i'd end up adding a blue tint to all my images. the form where i am typing this post is one of those solid white areas that looks yellow. the napkin is reflecting room light (much of it from the sun outdoors coming in through a couple windows). the laptop display is emitting its own light (with a bit reflecting off the napkin). this has to be the cause of there being a difference. but why do the display's "white" area look beige-yellow to me? why that color? is there a way to change that while keeping everything else the same? could changing the color of my room light fix this for me? RE: color vision - DPaul - Sep-17-2022 Hi Skaperen, You touch on one of the biggest probs in digital photography. The apparatus that took the pic, the one that shows the pic, the one that prints the pic, are all different. I have an Eizo screen with a built-in "spider" that once in a while "recalibrates" itself, providing you switch off the room lights. To answer your question: if (pure) white does not look white to you, the rest of the colors must also be off by a fraction. You do not mention the viewing software, but eg. most photo softwares have a color picking tool. As you hover over the whites, it should say +/- RGB 255,255,255 or thereabout. If it has an overdose of something else, you can say: this is white, click, and everything is proportionally straightened out. Red is also notoriously difficult. And, ... if it looks right on the screen, it will not necesarily print right. Paul RE: color vision - Skaperen - Sep-17-2022 i view images mostly with Firefox (the versions over many years all look the same up to version 104 i have now). sometimes i view with other programs like feh or mpv (videos). there is no difference. when i capture an image with a large white area using a screen capture program, viewing that file looks just the same. i suspect there is a mental aspect to color vision involving the background light. if there is no background light in a dark room then the display can look its best, however good or bad that will be. i should try some viewing in a dark room. RE: color vision - DPaul - Sep-18-2022 If you view them in firefox, make sure the image is in the Srgb color space. Makes a huge difference. Paul RE: color vision - Gribouillis - Sep-18-2022 Also you can perhaps adjust the colors with the graphic card configuration. On my desktop computer there is a GUI app named «NVIDIA Xserver settings» with plenty of parameters to adjust. Among them there is a «Color correction» tab for each display where I can set brightness, contrast and gamma. I can also do it for each R G B channel. RE: color vision - Skaperen - Sep-19-2022 (Sep-18-2022, 06:01 AM)DPaul Wrote: If you view them in firefox, make sure the image is in the Srgb color space.how can i control that if i have no control over the web site? does Firefox have a setting for that? RE: color vision - Skaperen - Sep-19-2022 (Sep-18-2022, 01:41 PM)Gribouillis Wrote: I can also do it for each R G B channelthat sounds great! but i have seen nothing to support my laptop. looks like an Intel chip.
RE: color vision - DPaul - Sep-19-2022 I use lightroom, which has an "export setting" to export as sRGB. This should be standard for any jpeg viewed online in a browser. (I usually work with raw to jpeg. ) An original photo is taken by some apparatus that has some color space (eg. profoto RGB), and you want to change that into sRGB for better online viewing experience. My cam has a menu, so I can choose in which color space I take pics. If I want it printed, i want yet another color space, because I'm not sending sRGB pics to the printer's shop. For jpg to jpg conversion, you'll have to find a tool that has color space as a parameter, and do some tests. Paul RE: color vision - Gribouillis - Sep-19-2022 (Sep-19-2022, 12:48 AM)Skaperen Wrote: looks like an Intel chip.I don't know about Xfce but in Kde in the system settings, there are controls to configure the colors of the display. RE: color vision - Skaperen - Sep-20-2022 (Sep-19-2022, 07:04 AM)DPaul Wrote: I use lightroom, which has an "export setting" to export as sRGB.so, how do i set up Firefox to use lightroom for all my web viewing, including videos and YouTube? and how will the lightroom discover what colorspace the image it gets is? i know formats like BMP and GIF don't have parameters to tell this. |