On Mon, 19 Dec 2011 11:06:22 -0500 Kevin Horkan wrote:

I've tried some research on this subject but have come up with little definitive information. I'm new to gimp, have used photoshop some, and am new to the iMac and OSx operating system. As a photographer moving from prosumer to professional (hopefully), I am wondering about the quality differences between gimp and photoshop, especially in the bit rate area. If the bit rates make a difference to the quality of the finished product (especially prints), will gimp be going to higher bit rates, and will this include the mac version? Thanks for the help.

On Dec 18, 2011, at 7:00 AM, gimp-user-list-request@gnome.org wrote:

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Today's Topics:

1. Gimp For Lion? (Jacob Gorneau) 2. Re: Gimp For Lion? (Michael Natterer) 3. Re: Splash Image (Alexandre Prokoudine)

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Message: 1 Date: Sat, 17 Dec 2011 11:22:14 -0500 From: Jacob Gorneau
To: "gimp-user-list@gnome.org"
Subject: [Gimp-user] Gimp
For Lion? Message-ID:

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Hello, I have a Macintosh and have recently upgraded to the OS X Lion. I am interested in your GIMP program, and was wondering if you were coming out with a GIMP for the Lion. If not, can I still work with and export photos from the Snow Leopard GIMP? Thanks, Jacob

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Message: 2 Date: Sat, 17 Dec 2011 22:24:30 +0100 From: Michael Natterer
To: Jacob Gorneau
Cc: "gimp-user-list@gnome.org"
Subject: Re: [Gimp-user]
Gimp For Lion? Message-ID:
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On Sat, 2011-12-17 at 11:22 -0500, Jacob Gorneau wrote:

Hello,
I have a Macintosh and have recently upgraded to the OS X Lion. I am interested in your GIMP program, and was wondering if you were coming out with a GIMP for the Lion. If not, can I still work with and export photos from the Snow Leopard GIMP? Thanks, Jacob

If you get very latest pango, gtk+ and gimp (preferrably git master of all of them), it works really well on lion. We usually don't do installable binaries, unless somebody steps forward and does it.

As a general note (not to you), I hope that whoever decides to package gimp as an app bundle this time does is in cooperation with the developers, and doesn't just patch it up, dump the patches on some unrelated sourceforge project, and provides a bundle to download.

The way the windows packages are done works without *any* patches to the source, because the packager hangs out on irc and is an upstream developer, whatever gimp needs to be packaged on windows is simply in upstream git.

I'm writing this here on gimp-user not to insult or antagonize the people who have packaged gimp for mac in the past, but only so that everybody can read it: please, come to irc/mailing list/bugzilla and tell what patches you need to make gimp properly relocatable, bundleable, whatever, and we can work together to get it upstreamed.

thanks,
--mitch

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Message: 3 Date: Sun, 18 Dec 2011 11:42:24 +0400 From: Alexandre Prokoudine
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gimp-user-list@gnome.org Subject: Re: [Gimp-user] Splash Image Message-ID:
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On Fri, Dec 16, 2011 at 9:53 PM, Madeleine Fisher wrote:

I was just reading the list of tasks left on developing GIMP 2.8 and one of them was "Decide on a splash image." Is this open for submissions or are they just trying to pick one from the entries they already have?

Hi Madeleine,

Yes, we are interested to have a choice of potential splash screens from. It's probably too late to have a real contestof some sort, but the more variants we have, the better choice we can make :)

Alexandre Prokoudine http://libregraphicsworld.org

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My sister is a professional graphis person. Has been for many years. She uses Photoshop on Mac.

I let her run Gimp (not 2.6.11) on one of my Linux boxes. She was very impressed. She saw a lot of features she did not expect to see. Said that you could actually do professional work that would be aceptable to print shops.

Tom

On Mon, Dec 19, 2011 at 8:06 PM, Kevin Horkan wrote:

I've tried some research on this subject but have come up with little definitive information.

Alexandre Prokoudine writes:

On Mon, Dec 19, 2011 at 8:06 PM, Kevin Horkan wrote:

I've tried some research on this subject but have come up with little definitive information.  I'm new to gimp, have used photoshop some, and am new to the iMac and OSx operating system.  As a photographer moving from prosumer to professional (hopefully), I am wondering about the quality differences between gimp and photoshop, especially in the bit rate area.

Photoshop wins right now

But Darktable (http://darktable.sf.net/) runs on Mac, right? I highly recommend using Darktable for RAW editing (especially things that have to do with color/exposure changes), then opening in GIMP for transformations and touch-up.

I'm no expert, but the way I understand it:

If you're producing for screen/web at least, 8 bit vs 16 bit doesn't matter for a static image in itself, since what you see on the screen is no more than 8 bit anyway. Where it matters is in the editing process, since certain operations (e.g. color curve changes) can lead to minor "rounding errors". 16 bits means you have more numbers of each color, similar to having more decimal places. E.g. if you don't know how to deal with decimal points, and you do one operation that divides by 3 and then times 2,

10 / 3 = 3.333… ≃ 3, 3 * 2 = 6

while if you keep one decimal until you're done calculating,

10 / 3 = 3.333… ≃ 3.3, 3.3 * 2 = 6.6,
(and now we're done calculating, round off the last digit:) 6.6 ≃ 7

And that kind of rounding can add up.

The picture in http://www.microstockgroup.com/photoshop-discussion/8-bit-or-16-bit/ gives an example of an image edited once in 8 bit and once in 16 bit which was then converted to 8 bit.

HTH, Kevin Brubeck Unhammer

On Wed, Dec 21, 2011 at 12:26 PM, Kevin Brubeck Unhammer wrote:

photographer moving from prosumer to professional (hopefully), I am wondering about the quality differences between gimp and photoshop, especially in the bit rate area.

Photoshop wins right now

But Darktable (http://darktable.sf.net/) runs on Mac, right?

1. Not the up to date version.
2. You don't get local editing.

If you're producing for screen/web at least, 8 bit vs 16 bit doesn't matter for a static image in itself

Oh, it does matter :) It's not about viewing, it's about rounding errors.

Alexandre Prokoudine http://libregraphicsworld.org

Alexandre Prokoudine writes:

On Wed, Dec 21, 2011 at 12:26 PM, Kevin Brubeck Unhammer wrote:

photographer moving from prosumer to professional (hopefully), I am wondering about the quality differences between gimp and photoshop, especially in the bit rate area.

Photoshop wins right now

But Darktable (http://darktable.sf.net/) runs on Mac, right?

1. Not the up to date version.
2. You don't get local editing.

If you're producing for screen/web at least, 8 bit vs 16 bit doesn't matter for a static image in itself

Oh, it does matter :) It's not about viewing, it's about rounding errors.

… which happen when you're editing. By "static image" I meant when you're just viewing ;)

-Kevin