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DPChallenge Forums >> Tips, Tricks, and Q&A >> Do any of you use the free editing program, GIMP?
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10/31/2003 03:15:58 AM · #1
If so, is there a way for me to resize my image smaller without losing a high amount of quality?

I've been trying to do this since I've started shooting my images in file sizes higher than 640x480.. but when I upload them to the website, there are these not so attractive anomolies that are clearly from my downsizing.

I've read about interpolation in the GIMP manual and I read the resizing tutorial, but I'm not sure how that all works if I'm going smaller instead of bigger.

I'm getting a little frustrated because I can see how the loss of quality is affecting the image and thus my scores too. What am I doing wrong and do any of you have some easy to understand tips to get what I'm looking for? General tips are good, but if anyone has experience with GIMP, GIMP specific tips would be great too.

Thanks,

Sia
10/31/2003 03:56:00 AM · #2
I just go image -> scaleImage, and apply unsharp mask after.

You could try Gimp 1.3.x, which is the development branch. It may have a better algorythm.
10/31/2003 03:56:36 AM · #3
right click..
scale image
then 640 in required box.
ok

right click
File
Save As
ok
****now, make sure smoothing is off (0.00)
****set quality as high as possible and stay within the image size (image size is shown up the top)
Click ok


Works fine for me..

Right click on image is what you use in linux to pull up a menu, the windows version may be different, I am not sure, but in general, it will still be the same.

edit: using gimp 1.2.4
theres a 1.2.5 and 1.3.21 also available.

Message edited by author 2003-10-31 03:59:46.
10/31/2003 04:21:57 AM · #4
Originally posted by cvt_:

right click..
scale image
then 640 in required box.
ok

right click
File
Save As
ok
****now, make sure smoothing is off (0.00)
****set quality as high as possible and stay within the image size (image size is shown up the top)
Click ok


Works fine for me..

Right click on image is what you use in linux to pull up a menu, the windows version may be different, I am not sure, but in general, it will still be the same.

edit: using gimp 1.2.4
theres a 1.2.5 and 1.3.21 also available.



I use the windows version, and save as and then pull the bar over as far as I can to 150k.. I don't have problems with losing any quality.
10/31/2003 06:05:36 AM · #5
Another trick is to do a sharpen after you resize the image. Setting it to around 30 works quite well after resizing the images from my G3. You should get similar results from your Sony.
10/31/2003 07:52:20 AM · #6
Originally posted by mbardeen:

Another trick is to do a sharpen after you resize the image. Setting it to around 30 works quite well after resizing the images from my G3. You should get similar results from your Sony.


I use unsharp mask at about 20/3 for a 640 wide image. I think sharpen magnifies noise too much and reduces the quality of the final 150Kb image (Because the noise doesnt compress as efficiently).
10/31/2003 08:02:19 AM · #7
I used to use unsharpen mask with my former camera, but I haven't had it work well since I got the G3. I think it takes some playing to find the correct settings for the images produced by each camera. And, of course, it depends quite a bit on the image itself.

Message edited by author 2003-10-31 08:02:46.
12/23/2003 11:51:47 PM · #8
Is the Gimp capable of saving images with the EXIF information, or is that lost?
12/23/2003 11:55:32 PM · #9
I don't know if Gimp saves EXIF, but if you are thinking about preserving it in case a challenge entry is questioned, you can just make a copy and edit the copy in Gimp while the original file is safe.
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