On Wednesday 01 November 2006 3:28 am, Tanveer Singh wrote:

I use GIMP for image manipulation. though lots of resources are availalbe for photoshop, gimp docs are hard to come by(from a photography point of view). Can somebody link me to a good online guide. I am looking for things like
1. Working with levels and curves, not just how to, but the technique too

http://www.gimpguru.org/
has lots of articles detailing advanced photo editing techniques with a gimp specific slant.

http://gimp-savvy.com/BOOK/ Old, but free, and still relevant.

2. Bulk watermarking, resizing

This is easier with ImageMagick
http://www.imagemagick.org/script/index.php I do something similar with that package myself.

3. Using RAW under windows
4. Psuedo HDR by superimposing 2-3 images

I can't offer much help with the rest of this. You might try http://ufraw.sourceforge.net/ and http://cinepaint.sourceforge.net/

CinePaint is a fork of the Gimp for film editing. UFraw is a Gimp plugin for RAW images. I don't know anything about either one, frankly.

On 11/1/06, Scott Bicknell wrote:

On Wednesday 01 November 2006 3:28 am, Tanveer Singh wrote:

I use GIMP for image manipulation.

[...]

2. Bulk watermarking, resizing

This is easier with ImageMagick http://www.imagemagick.org/script/index.php I do something similar with that package myself.

I once wanted to do some bulk image-resizing and tried to work out how to do this with GIMP, however I didn't quite find out how I would have to do that...

I ended up looking at ImageMagick and PIL (Python Imaging Library) and came to the conclusion that a custom script in Python best fit my needs; while mass-resizing images I didn't want to change the original aspect-ratio of each image so I needed to find out the original image-size and do some math before actually resizing the image and couldn't work out how to do easily that with the command-line tools provided with ImageMagick (also couldn't find up-to-date windows-installable Python bindings for ImageMagick).

I did lose EXIF-information in the process, but I decided that I could live with that loss. (ImageMagick would have kept that EXIF information for me though).

[...]

--

Scott

Cheers and good luck,

--Tim

Tim van der Leeuw wrote:

> I once wanted to do some bulk image-resizing and tried to work out how to do this with GIMP, however I didn't quite find out how I would have to do that...

David's Batch Processor, at: http://members.ozemail.com.au/~hodsond/dbp.html

Unfortunately, I've just been told there's a bug in the latest version. Hope to have it fixed soon.

David Hodson wrote:

David's Batch Processor, at:
http://members.ozemail.com.au/~hodsond/dbp.html

Unfortunately, I've just been told there's a bug in the latest version. Hope to have it fixed soon.

OK, I think it's fixed. You'll want version 1.1.5.

Le mercredi 1 novembre 2006 2:33 PM, Scott Bicknell a écrit :

On Wednesday 01 November 2006 3:28 am, Tanveer Singh wrote:

I use GIMP for image manipulation. though lots of resources are availalbe for photoshop, gimp docs are hard to come by(from a photography point of view). Can somebody link me to a good online guide. I am looking for things like
1. Working with levels and curves, not just how to, but the technique too

My website, in french, deals with levels and curves. http://creafab.free.fr/Tut_gimp/Retouche_photo/Retouche_photo_index.html

Hope this helps.

http://www.gimpguru.org/
has lots of articles detailing advanced photo editing techniques with a gimp specific slant.

http://gimp-savvy.com/BOOK/ Old, but free, and still relevant.

2. Bulk watermarking, resizing

This is easier with ImageMagick
http://www.imagemagick.org/script/index.php I do something similar with that package myself.

3. Using RAW under windows
4. Psuedo HDR by superimposing 2-3 images

I can't offer much help with the rest of this. You might try http://ufraw.sourceforge.net/ and http://cinepaint.sourceforge.net/

CinePaint is a fork of the Gimp for film editing. UFraw is a Gimp plugin for RAW images. I don't know anything about either one, frankly.

At the risk of being a heretic let me make the following suggestions Tanveer Singh wrote:

I use GIMP for image manipulation. though lots of resources are availalbe for photoshop, gimp docs are hard to come by(from a photography point of view). Can somebody link me to a good online guide. I am looking for things like
1. Working with levels and curves, not just how to, but the technique too

It's been my experience that the gimp tutorials are helpful, but no where near as complete as whats out there for Photoshop. That being said, if you understand the techniques in photoshop, it's not to difficult to map those to the gimp controls to do the same things.

2. Bulk watermarking, resizing

ImageMagik is your friend here

3. Using RAW under windows

ufraw as a plugin to gimp (install gimp first, then ufraw) works really nicely. At least as well as some of the commercial raw processors out there. You might want to check out "noise ninja" too.

4. Psuedo HDR by superimposing 2-3 images

I seem to remember that the gimp tutorials cover this as will most PS books. Here's the problem. GIMP is only 8 bits of dynamic range per color channel. Better digicams are 12 bits or better in their raw format. Your display screen can handle that dynamic range, but last I looked, your printer probably won't. So basically, what you're really doing is compressing a much wider dynamic range into a smaller one. Sometimes it looks right, and sometimes it doesn't. I think it's most useful for pulling up shadow detail where you really notice digital noise.

I am a newbie, so I apologize if this has been discussed before. In that case can somebody link me to the old thread?

regards Tanveer

On Wednesday 01 November 2006 17:34, jim feldman wrote:

At the risk of being a heretic let me make the following suggestions

Tanveer Singh wrote:

I use GIMP for image manipulation. though lots of resources are availalbe for photoshop, gimp docs are hard to come by(from a photography point of view). Can somebody link me to a good online guide. I am looking for things like
1. Working with levels and curves, not just how to, but the technique too

The book "Grokking the Gimp" is available online but you really want to buy a paper copy.