ee97c1f4ff
GIMP was doing evil hacks lying to GEGL about it's pixels being in a linear
color space when they are not. This causes incorrect rendering, makes gaussian
blur misbehave etc.
The legacy projection modes should be implemented using the same 2.2 gamma
formats that are correct to specify for sRGB data. (for proper color
management in higher bitdepths; icc backend babl formats should be used.)
For the old image modes correct babl formats are:
R'G'B'A u8 - 8 bit RGB with 2.2 gamma (sRGB) with linear alpha component
R'G'B' u8 - 8 bit RGB with 2.2 gamma (sRGB)
Y'A u8 - 8 bit Grayscale with 2.2 gamma with linear alpha component
Y' u8 - 8 bit Grayscale with 2.2 gamma
Y u8 - 8 bit linear data, used for masks/channels
A u8 - 8 bit linear alpha
-----------------------------------------------
RGBA float - 32bit floating point linear light RGB
RaGaBaA float - 32bit floating point linear light RGB, premultiplied alpha
to be used for processing that needs to scale by the alpha,
(blurs, resampling etc)
R'G'B'A float - 32bit floating point sRGB with gamma, to be used where
the result depends on being closer to perceptual when
processing, can be used a cheaper alternative to CIE Lab
based modes.
-----------------------------------------------
The legacy layer modes should use the formats with gamma 2.2 only for loading
and rendering legacy XCF files correctly, in the brave new world compositing
should most likely be done in linear light with "RGBA float" and even better
"RaGaBaA float" like GEGL does for porter duff and other compositing modes.
The ability to chose the legacy layer modes should probably be hidden from the
user unless an old .xcf has been opened.
------------------------------
GNU Image Manipulation Program
2.8 Stable Branch
------------------------------
GIMP 2.8 replaces earlier GIMP 2.x versions. It is advised that you
uninstall them before installing GIMP 2.8. If you want to keep your
older GIMP 2.x installation in parallel to GIMP 2.8, you have to
choose a separate prefix which is not in your default library search
path. Otherwise your prevoius GIMP installation will start to use the
new libraries. You have been warned.
If you think you found a bug in this version, please make sure that it
hasn't been reported earlier and that it is not just new stuff that is
still being worked on and obviously not quite finished yet.
If you want to hack on GIMP, please read the file HACKING. For
detailed installation instructions, see the file INSTALL.
1. Web Resources
================
GIMP's home page is at:
http://www.gimp.org/
Please be sure to visit this site for information, documentation,
tutorials, news, etc. All things GIMP-ish are available from there.
The automated plug-in registry is located at:
http://registry.gimp.org/
There you can get the latest versions of plug-ins, using a convenient
forms-based interface.
The latest version of GIMP can be found at:
http://www.gimp.org/downloads/
2. Mailing Lists
================
We have several mailing lists dedicated to GIMP user and development
discussion. There is more info at
http://www.gimp.org/mail_lists.html
Links to several archives of the mailing lists are included in that page.
Gimp-user-list is a mailing list dedicated to user problems, hints and
tips, discussion of cool effects, etc. Gimp-developer-list is oriented
to GIMP core and plug-in developers. Most people will only want to be
subscribed to gimp-user-list. If you want to help develop GIMP, the
gimp-developer mailing list is a good starting point.
3. IRC
======
And finally, for the real junkies, there is an IRC channel devoted to
GIMP. On GIMPNet (a private free software oriented network) there is
#gimp. Many of the developers hang out there. Some of the GIMPNet
servers are:
irc.gimp.org:6667
irc.us.gimp.org:6667
irc.eu.gimp.org:6667
4. Customizing
==============
The look of GIMP's interface can be customized like any other GTK app
by editing the ~/.gtkrc-2.0 file or by using "themes" (ready-made
customizations). For downloadable themes and further details, see
http://art.gnome.org/themes/gtk2 . Additionally, GIMP reads the file
~/.gimp-2.8/gtkrc so you can have settings that only apply to GIMP.
Included is a set of keybindings similar to those in Adobe Photoshop.
You can find them in the ps-menurc file. To use them, copy this file
to ~/.gimp-2.8/menurc. You can also manually change the keybindings to
any of your choice by editing ~/.gimp-2.8/menurc.
Have fun,
Spencer Kimball
Peter Mattis
Federico Mena
Manish Singh
Sven Neumann
Michael Natterer
Dave Neary
Martin Nordholts