Re: Epson canned profiles
Re: Epson canned profiles
- Subject: Re: Epson canned profiles
- From: Andrew Rodney <email@hidden>
- Date: Tue, 17 Apr 2018 11:57:24 -0600
On Apr 17, 2018, at 11:46 AM, Iliah Borg <email@hidden> wrote:
>
>> Fire up your favorite image editor.
>>
>> Fill half the screen with L*a*b* 6, 1, 4. Fill the other half with 7, 1, 4.
>> Overlay a couple patches of 6, 0, 0 and 7, 0, 0.
>>
>> By your very own math, the two background halves differ by 0.85 dE
>
> I did it and measured the actual deltaE rather than calculating it. It is
> 1.32.
He's again under the wrong impression that a difference of one Lab value
equates to 1dE which is just wrong.
He's assuming (again) that firing up an image editor is going to somehow
provide the dE math and allow differing formulas to give us that dE value.
He states but can't repeat: "By your very own math, the two background halves
differ by 0.85 dE" or he'd see his example is flat out wrong.
Or that it's 'my math' rather than a tool color pro's use to actually provide
dE values with many differing formulas. I used dE 2000, he of course can't.
> Telling colours apart when printed ob different printers / using different
> papers / different profiles is not the same as comparing two large patches
> side by side.
Which is why I posted the very fine and useful GUI from CT&A to visually show
what a dE of (fill in the blank) appears like on-screen. You're not going to
find this in a 'so called favorite image editor.' But Ben's toolset appears to
be very limited. Which explains his ideas about color here.
> deltaE is not a perfect perceptually uniform measure, but generally worrying
> about anything below 1 dE is more like splitting hairs.
Exactly!
> I'm sorry that this discussion came to it.
Don't be!
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