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Joseph Holmes Ekta Space with Gamma L
Dear photographers, as many of you i use for the scanned output an excellent color space Ekta Space PS 5 by Joseph Holmes. This space fine represent a color gamut of scanned transparencies.
But with gamma 2.2 these images lacks details in shadows, and often have a steps in the tonal gradients. Joseph on his site offer a paid modified version of his space, called Chrome Space 100, with the same primaries and gamut, but modified tone curve, as he wrote, - "very carefully designed to match the tonality of perceptually linear printers". Here i do not have enough skills to design such a complicated curve, but i decided to simply replace the curve in the Ekta PS5 profile with the perceptually linear L* tonal curve. This takes desired effect with more smooth tonal gradients but more bright blacks. Here i want to ask dear photographers to test this colorspace especially against paid Chrome Space 100.
Attachment 180150
A link to Holmes comparison
https://www.josephholmes.com/profile...ail-comparison
Get profile
Re: Joseph Holmes Ekta Space with Gamma L
I have Joseph’s spaces. I can compare them tomorrow.
Re: Joseph Holmes Ekta Space with Gamma L
Dear Peter, i will appreciate!
Re: Joseph Holmes Ekta Space with Gamma L
I took a file and converted to Ekta Space, the original, and then duplicated it. For the first one, I then assigned Chrome 100. It lightened everything. For the second one, I assigned your space. It darkened everything. So if the goal is to get more shadow separation, then you're moving in the wrong direction.
Re: Joseph Holmes Ekta Space with Gamma L
Quote:
Originally Posted by
yeolde
Dear photographers, as many of you i use for the scanned output an excellent color space Ekta Space PS 5 by Joseph Holmes. This space fine represent a color gamut of scanned transparencies.
But with gamma 2.2 these images lacks details in shadows, and often have a steps in the tonal gradients. Joseph on his site offer a paid modified version of his space, called Chrome Space 100, with the same primaries and gamut, but modified tone curve, as he wrote, - "very carefully designed to match the tonality of perceptually linear printers". Here i do not have enough skills to design such a complicated curve, but i decided to simply replace the curve in the Ekta PS5 profile with the perceptually linear L* tonal curve. This takes desired effect with more smooth tonal gradients but more bright blacks. Here i want to ask dear photographers to test this colorspace especially against paid Chrome Space 100.
Attachment 180150
A link to Holmes comparison
https://www.josephholmes.com/profile...ail-comparison
Get profile
Hi, what do hope to achieve that you could not achieve, with just 16 bit input, a modern floating point image editor, and profiling?
His approach makes sense if you need to conserve space, but in 2018 is this really best practise?
Re: Joseph Holmes Ekta Space with Gamma L
Dear Peter, thank you for the experiment! Looks like Joseph space have curve really differs from L*
Dear Ted, my goal is just to have a color space for editing, which, when being assigned, correctly represent slide look, instead of assigning a large spaces with unnatural colours
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Re: Joseph Holmes Ekta Space with Gamma L
Quote:
Originally Posted by
yeolde
Dear Ted, my goal is just to have a color space for editing, which, when being assigned, correctly represent slide look, instead of assigning a large spaces with unnatural colours
Hence my post, there is nothing that Joseph is offering that can't be achieved with a more modern method. IMHO The stuff he is discussing is very complex, easily misunderstood and hence is easy to go down the wrong rabbit hole.
Re: Joseph Holmes Ekta Space with Gamma L
Yep, but what is the modern method?
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Re: Joseph Holmes Ekta Space with Gamma L
Why not just buy it? It's not expensive. " 10) All eight Holmes Master Profiles only (DCam 1, DCam 2, DCam 3, DCam 4, DCam 5, Chrome Space 100, Ekta Space PS5, and Monochrome): $30
You can use this 8 profile set to help you decide which full set(s) you may want or just to use by themselves. Please refer to the extensive information on these four pages: first second third fourth to help you choose what's best for you."
Ted's right that the theory behind all of these is complex, but on the other hand, they're very easy to use. My serious work is with BW, though, and so I rarely use them.
Re: Joseph Holmes Ekta Space with Gamma L
Dear Peter, its not a money questions, im experimented with a profile editing to improve a look of slides and give a space for the editing.
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