[Alt-photo] Separating channels

Diana Bloomfield dlhbloomfield at gmail.com
Wed Oct 22 13:30:44 UTC 2014

Hey Henry,

I've mentioned this before, but I use GIMP (free, open-source) to make separation negatives for tri-color gum.  I have never used Photoshop.  Granted, I do almost everything in-camera, so I don't do a lot of complicated work afterwards.  Not that the GIMP couldn't do some complicated work-- I've just never tried it.  I do get the negatives curved correctly for the process I'm using, and GIMP does that just fine.  I have never had an issue with it-- works perfectly for my purposes.  I'm not sure why more people don't use it, except that it's free.  If it cost the same as PS, more people would be using it, I'm sure.  I've also always used Macs.  

You can download GIMP in about 20 minutes.  http://www.gimp.org


On Oct 22, 2014, at 6:29 AM, Henry Rattle <henry.rattle at ntlworld.com> wrote:

> 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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