I had composed a response, and then shortly before sending, WIFI on my
laptop conked out. I think yahvuu covered most of what I was going to
say, though. I'll send it anyway when I pull the laptop out again.
On 02/10/2010 07:09 PM, yahvuu wrote:
> Martin Nordholts wrote:
>> On 02/07/2010 04:55 AM, Omari Stephens wrote:
>> "1) When an image is opened with no associated color profile, we assume
>> that it is encoded in sRGB space."
>> I don't think we should assume that, do you have an example use case
>> where that is a good idea?
> I think the best guess is sRGB, assuming a file that was produced by a legacy
> Which were (back then) to be viewed on monitors with a profile similar to
> Another source for images of these kind are web developers who want to
> achieve consistent colors cross a web page -- the rationale beeing:
> if the browser has no color profile information, the colors may be wrong,
> but at least consistent.
> Among garden-variety photo labs, it's pretty much standard to discard any
> color profile information and just assume sRGB.
>> I think we should rather assume the image is in the working space color
> The user's choice of a working space does not reveal any information about
> an unknown image. I don't think the chosen working space should be
> used as input for import heuristics.
>> My thinking is that it is the same working space color profile
>> that is used for the GIMP color picker and also for images without a
>> color profile attached. So when you pick RGB 128,128,128 in the GIMP
>> color picker and open an image with no color profile, RGB 128, 128, 128
>> in the image will be displayed the same as RGB 128,128,128 in the GIMP
>> color picker.
> OK, the color picker's colors must match, of course. Probably that means
> that the color picker can't show any numbers as long it's not yet clear
> which color space it will be assigned to.
> Or, perhaps better: the color picker gets disabled when no image is open.
> But the same problem still occurs when switching between images with
> different working color spaces. The very same color may have different
> RGB values in different color spaces. Assuming a calibrated monitor,
> the color picker displays absolute colors, so i think the RGB values
> should change, not the colors.
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