Celestia Forums

Hi all,

find below a few selected, excellent tutorials with the GIMP that will teach interested potential "image manipulators" some basic techniques.

Everyone interested e.g. in assembling cylindrical texture maps from Cassini photos, should know these things before starting.

To get some first feedback, I have asked ElChristou to comment about that selection. This is presumably quite useful for others. If YOU want to make comments as well, please DO SO!

Your impressions might get others interested and some fun communication and joint learning experience may evolve from it...

Here are the URL's along with ELChristou's comments [pink]:

GIMP Tutorials:

beginner:
--------

http://www.gimp.org/tutorials/Bezier_Selections/
quite utile, easy to understand
http://www.gimp.org/tutorials/Quickmask/
I can not really imagine what you do with this option (in the map treatment)

Intermediate:
-------------

http://www.gimp.org/tutorials/Changing_ ... d_Color_1/
Yes using Alpha channel is always very utile
http://www.gimp.org/tutorials/Changing_ ... d_Color_2/
This tool is not so easy to use... it's hard to control the selection with a mid tone image...
http://www.gimp.org/tutorials/Tileable_Textures/
Yes gradient brush is super utile (have you used it in the bottompart of Titan?) and playing with offset is evident to work on the edges of the map.

Expert:
-------


Photo Editing
-------------

http://www.gimp.org/tutorials/Reducing_CCD_Noise/
http://www.gimp.org/tutorials/Selective_Gaussian_Blur/
The two here are complementary, newbies will need to make some test with selective gaussian blur.
http://www.gimp.org/tutorials/Blur_Overlays/
I'm not sure of the utility of this one, on photoshop for example with 2 layers and some color/balance and luminosity/contrast you get the same more quickly...
http://www.gimp.org/tutorials/Blending_Exposures/
This one is just an image composing... just good for a layering exercice
http://www.gimp.org/tutorials/Smart_Sharpening/
Yes, very good and very professional... good to understand the purpose of using LBA. The edge detection is only utile for very specific images... not sure (but I never test) of the result on a map moon (lot of crater), it will be to sharpened...

******************

ElChristou wrote:With such tutorials beginner can understand quickly these topic... but they will need exercices.
Indeed, each one have to make his experience, good result like yours won't come immediatly; but I don't really worry for this part.

If needed, I can help with newbie question on those topic.

*******************

In many instances, I tend to agree with ElChristou, but not in everyone of his comments, of course . Perhaps at a later stage, it might be useful to discuss our different views.

Enjoy,

Bye Fridger

Hi, everybody

A quick message for Photoshop owners:

These tutorials are pointing to functions existing on both programs, so having a look is not forbiden .

Bye

in my exp with both gimp and p.s.elments , once you learn the basics of
each then for the most part the tutorials are mostly interchangable

EXCEPT all the things to click are in diff. places
but the concept is the same
if you learn one in P.S. then it will take you 5 min. to get it in gimp vs./vs.

and gimp is easy to use , it can be learned in 1 wk. and you can have a fair mastory of it in 2 mo.

Hi,

Some of us are waiting for (at least) the people who have respond to the Fridger?€™s poll; so guys, went you have time, a little comment please.

Maxim / Trenner: observers

Bob Hegwood / Brendan / Jdou / Chaos syndrome: your opinion on those tutorials?

Rthorvald is waiting for further stage (right??)

John Van Vliet: what?€™s new with your problems with the mmps port? Do you know a way to port it for the osX (unix like) platform too?

Myself, I'm waiting for your reactions.

Bye.

I don't expect to have much problems with Gimp or Photoshop.
And, as I'm currently almost overloaded with work at least 'till end of march, I will follow the lessons with quite some delay.

maxim

At the moment I don't have much time to do image stuff, so I'm not going to be able to actually work through these for a while, however I have taken a look at the tutorials and they do look clear and well-explained as far as I can see.

Hi all,

Very interesting, but a little depressive for me
Now, I understand how much I'm a newbie or even a "Brain-dead" about images transformations
I learnt a lot in particurarly about the "Smart sharpening"

As Maxim and Chaos syndrome I don't have enough time to do all what I have to do, but I will take a look at the lessons (and I will try to understand )

jdou

jdou wrote:Very interesting, but a little depressive for me

Don't worry there is nothing really hard for the moment .
If you want to understand what will follow, you need to familiazize yourself with those bases. Seems that Fridger don't want off topic questions when we will be talking on other kind of task...

So for the questions on photoshop/gimp bases it's the good moment.

Tu peux me contacter via les "private messages", je me ferais un plaisir de r?©pondre ?  tes questions.

The good use of photoshop/gimp is not only helpfull for the cylindricals maps but also for all kind of work in add-ons creation...

Bye

Hi,

I have a some good experience now with photoshop and 'infographie' in general and I really look forward to get help about cylindrical texture maps...

@+
Vincent

as for an off topic

with mmps there is a "simple???" problem of rewriting image.cpp for straters to ues win calls and not mmap calls --- ohh i wil figure it out , but in the meen time it builds in cygwin and cygwin1.dll is included in my dl ( 7-zip file)

The Gimp explanations are already very good.
I found almost the same commands on PS but not, of course, at the same place or menus.
So I'm going to install Gimp on my PC.
I think that will be easier to execute the examples given.

Thanks ElChristou for your help.

Jdou

Fridger,

Sorry I've been away, but I'm back now...

Also, what gives here? I thought that you were going to give us a
tutorial on how to manipulate textures for Celestia.

Hell, I can view the Gimp tutorials any time, but I thought that you
had some specific instruction in mind.

No? Your superb Iapetus texture would be a great example for such a
tutorial... Just a thought.

Thanks, Bob