[Alt-photo] Separating channels

Henry Rattle henry.rattle at ntlworld.com
Thu Oct 23 08:56:30 UTC 2014

Dear All,

Thank you so much for solving my dilemma - so good to have friends round the

Best wishes


On 22/10/2014 18:39, "Gordon Holtslander" <gjh at shaw.ca> wrote:

> Yes, currently (version 2.8) gimp only supports 8 bit color. 

Work is in
> progress to support up t o 6 4bit per color channel available in 2.10

No word on when version 2.10 will be
> available. IE it will be ready when its ready ... 

It will be really
> interesting if/when GIMP supports 64 bit space, and Photoshop only supports 16
> ... 

A few years ago a "fork" of gimp was made to support higher bit depths.
> It was used in the film industry and called CinePaint. 
Currently it only
> works on Linux and usually must be compiled from source


Gordon J. Holtslander
gjh at shaw.ca 
Learn about HSP http://sp-foundation.org 

----- Original
> Message -----

From: "tdp" <tdptdp at gmail.com> 
> alt-photo-process-list at lists.altphotolist.org 
Sent: Wednesday, October 22,
> 2014 9:39:22 AM 
Subject: Re: [Alt-photo] Separating channels 

Please be
> aware that if you use GIMP you will be limited to 8-bit RGB color
separations. If you require CMYK support, or 16-bit support, Photoshop is
still your only option. 

I love GIMP, but it is ... gimped? And has been for
> way, way too long. If 
8-bit RGB works, GIMP is a far better option than
> Photoshop. 

On Wed, Oct 22, 2014 at 4:29 AM, Henry Rattle
> <henry.rattle at ntlworld.com> 

> Hi everyone, 
> The only thing I
> use my elderly Photoshop CS for is to separate channels 
> for 
> tricolour
> gum (and soon, I hope, casein!). It's not worth hundreds of 
> pounds 
> for
> me to update to a new version of PS to run on my iMac just for that one 
> task. But to use CS, I have to maintain a separate bootable Snow Leopard 
> disc, which seems a lot of trouble for one job. 
> Can anyone point me to a
> mac-friendly application that will separate 
> channels, preferably cheap or
> free? 
> Many thanks 
> Henry 
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