[Leica] question about image viewing and profiles

[Jeff Moore]

Once this exercise is over, I'd be fascinated to hear back about which
platform or platforms handle the differing profiles especially badly.

But... whatever the result, I guess I'd just internalized the notion (so
long ago that it no longer occurs to me to question it) that any and all
images you intend to display on other people's computer screens should be
in sRGB.  That's just baked into the workflow by now.


On Thu, Apr 23, 2020 at 2:50 PM Jeff Moore <jbmmllug at jbm.org> wrote:

> In different tabs of a latest-Chrome browser on my Mac (running 10.3.6),
> on a recently-calibrated Eizo monitor...
>
> They are indistinguishable from each other.  Both have whites very near
> white, blacks very near black, and pleasing "snap".
>
> On Thu, Apr 23, 2020 at 1:01 PM Brian Reid <reid at mejac.palo-alto.ca.us>
> wrote:
>
>> I've been looking into complaints that the LUG gallery is muddying many
>> images that Bill Clough is posting. They don't look muddy to me, but I
>> believe the people who say that they see mud.
>>
>> After some research, I determined that the majority of his images in the
>> gallery are tagged with the ICC profile "Gray gamma 2.2", which is put
>> there by his film scanner. I have a profile by that name on my computer,
>> so when I clicked on his images, the conversion was done correctly by my
>> image viewing software and I saw what he intended.
>>
>> I wonder how many LUG people are seeing mud. Do you see any significant
>> difference between the image quality of these two images:
>>
>> A:
>> http://gallery.leica-users.org/d/486424-2/Harvest_+Estes+Park_+1987.jpg
>>
>> B:
>> http://reid.org/~brian/images/Estes%20Park%20with%20sRGB%20profile.jpg
>>
>> On my screen, those images look very similar but not totally identical.
>> I guess it depends on which software component is doing the color
>> transformation.
>>
>> If you don't see much of a difference, that means that your computer is
>> dealing successfully with the unusual but not illegal profile "Gray
>> gamma 2.2", which is intended as a Photoshop preview-mode pseudo-profile
>> and not an imbedded profile. I guess nobody told this to the
>> manufacturer of Bill's scanner.
>>
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>