Forums
New posts
Search forums
What's new
New posts
New media
New media comments
New profile posts
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Learning
Photography Q&A
Color Space
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="WayneF" data-source="post: 364447" data-attributes="member: 12496"><p>Absolutely wonderful as it is (era changing), I think there is much danger in the internet. Anyone can post anything. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> And if they are explaining Color Management without understanding it, this causes risk to our own understanding.</p><p></p><p>Do not misunderstand, not many understand less about CM than I do. I have lots of questions about the basic premises. I find I can choose sRGB and then ignore it. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>But the camera digital senor or the film scanner sensor simply scans the color that they see. And all RGB is device dependent.. if Red is value 251, it will be presented as a different shade of red on all devices trying to show it. 251 simply means about as bright as the device can make it, whatever that is. RGB will be different with dye ink, or pigment ink, on papers of different reflectivity. It will be yet different again if shown by a CRT monitor, or a LCD monitor, or an old one or a new one, your monitor or my monitor, or a calibrated one or not, etc. </p><p></p><p> RGB is simply absolutely device dependent. There are no absolute RGB colors. Red 251 is not a specific color, it only means whatever the device can do with it. We may fault monitors as being limited to sRGB, but to me, they seem much less limited than printer ink. Reflected color (prints) can have less than half the dynamic range of transmitted color (monitors).</p><p></p><p>Yet we can simply declare at will that sensor results will be sRGB, or aRBG, or whatever? Our choice? That is very convenient. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>The article in the link shows the top left picture here:</p><p></p><p><img src="http://www.scantips.com/g2/argb.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>It claims this is the difference in sRGB and aRGB, all of course as shown on my sRGB monitor, in my browser. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>But the one thing I do know is that the CIE chromaticity diagrams always show no difference in red or blue, but aRGB only has a greater extent of green, same as this one on Wikipedia.</p><p></p><p>Yet, the RGB histograms of just that one left color varies drastically in all RGB channels, top and bottom (histogram order there is green, blue, red, dark to light). Why did red and blue change? Some people don't understand all they think they know, and one of them is me. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>I think any CM study should require considerable consensus by knowledgeable people... not just some internet source.</p></blockquote><p></p>
[QUOTE="WayneF, post: 364447, member: 12496"] Absolutely wonderful as it is (era changing), I think there is much danger in the internet. Anyone can post anything. :) And if they are explaining Color Management without understanding it, this causes risk to our own understanding. Do not misunderstand, not many understand less about CM than I do. I have lots of questions about the basic premises. I find I can choose sRGB and then ignore it. :) But the camera digital senor or the film scanner sensor simply scans the color that they see. And all RGB is device dependent.. if Red is value 251, it will be presented as a different shade of red on all devices trying to show it. 251 simply means about as bright as the device can make it, whatever that is. RGB will be different with dye ink, or pigment ink, on papers of different reflectivity. It will be yet different again if shown by a CRT monitor, or a LCD monitor, or an old one or a new one, your monitor or my monitor, or a calibrated one or not, etc. RGB is simply absolutely device dependent. There are no absolute RGB colors. Red 251 is not a specific color, it only means whatever the device can do with it. We may fault monitors as being limited to sRGB, but to me, they seem much less limited than printer ink. Reflected color (prints) can have less than half the dynamic range of transmitted color (monitors). Yet we can simply declare at will that sensor results will be sRGB, or aRBG, or whatever? Our choice? That is very convenient. :) The article in the link shows the top left picture here: [IMG]http://www.scantips.com/g2/argb.jpg[/IMG] It claims this is the difference in sRGB and aRGB, all of course as shown on my sRGB monitor, in my browser. :) But the one thing I do know is that the CIE chromaticity diagrams always show no difference in red or blue, but aRGB only has a greater extent of green, same as this one on Wikipedia. Yet, the RGB histograms of just that one left color varies drastically in all RGB channels, top and bottom (histogram order there is green, blue, red, dark to light). Why did red and blue change? Some people don't understand all they think they know, and one of them is me. :) I think any CM study should require considerable consensus by knowledgeable people... not just some internet source. [/QUOTE]
Verification
Post reply
Forums
Learning
Photography Q&A
Color Space
Top
