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DPChallenge Forums >> Tips, Tricks, and Q&A >> Help with image editors
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02/01/2003 03:19:12 AM · #1
I use Microsoft Photo Editor (i can't afford/find anything better)
Here is a crop of a part of an image, if i increase the contrast to what i want it to be (to make the rainbow more evident), it makes the image all grainy. This happens to all my photos and really sucks...

Does this happen with all photo editors or only sub standard ones like mine? Anything ideas?

before:
abc.JPG
after:
bcd.JPG

i'm having trouble getting pics working so copy/paste these links:
http://www.geocities.com/paul_rulz2/abc.JPG
http://www.geocities.com/paul_rulz2/bcd.JPG

Message edited by author 2003-02-01 03:48:05.
02/01/2003 04:17:38 AM · #2
you can get rid of alot of grain with neatimage ( http://www.neatimage.com ) and yes this is legal :). i simply adore this program, as i love taking alot of low-light images. It's a must for me to be able to clean it up.

i took the liberty of cleaning up your rainbow:

Original:

rainbow.jpg

after one pass:

rainbow_filtered.jpg

after 2 passes (ie, reloading the pic, and reducing noise again):

rainbow_filtered_filtered.jpg

this might not have been the best example, as it might just look like it's blurring it, but it truely does keep the details when there are some, like a tree branch or whatever. it's quite intelligent and worth a look at.

02/01/2003 09:22:00 PM · #3
thanks alot for your help
02/02/2003 10:25:09 AM · #4
Hi Paul,
There may be more going on here than meets the eye. Looking at your "after" crop, I suspect you may have a lot of JPEG artifact. Try setting your camera to its highest quality mode, take a shot, set it to a low quality mode, take the same shot, then try increasing contrast of both. You should see much smoother results with in the highest quality mode. Noise and JPEG artifact tend to be very noticeable in blue sky.
By the way, I tried adjusting contrast of your crops in Photoshop 7, the results are just as bad as in your editor. I've also tried neatimage and found that for many (not all) images it produces pretty good results.
A final note, when re-saving images, its best to work in a non-lossy format like .TIF. If this is not convenient, save as JPEG at very high quality until the last step, then tweak compression to achieve the smallest file size that produces acceptable image quality.
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