Re: Profoto
Re: Profoto
- Subject: Re: Profoto
- From: email@hidden
- Date: Sat, 1 Dec 2001 12:48:00 EST
In a message dated 11/30/01 12:45:11 PM, email@hidden writes:
>
I did a quick test
A couple of issues with your test, Jon:
You are seperating the same color *recipe* from two different spaces, not the
same *color* from both spaces. This will only have significant effect on
artificial vector colors that some designer has defined as 0, 255, 0... not
real photo colors which won't reach this type of high numbers even in a
midsize space like AdobeRGB. So its important to test similar colors, as well
as maximal colors, by converting the test file via "convert to profile" to
the larger space, as well as by not converting it by using "assign profile"
when moving it to the larger space.
You don't include stepped color patch info, to show what other colors are
doing at the same time. There is a phenomenon common to profile based color
conversions where the maximum saturation colors do not process effectively,
leaving the outside row of patches in a 2d color slice very unsaturated,
while the next row in, which somewhat lower numbers in the initial space, end
up seperating very well. So again, photos might convert excellently, while
the maximal colors might not. Try your conversions on the 729 patchs (9x9x9
patch color cube) that forms the color target in ColorVision Profiler
software, or any similarly organized patch set, and you will see these
variations immediately.
C. David Tobie
Design Cooperative
email@hidden