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05/08/2004 04:38:13 PM · #1 |
Hi. I have Photoshop CS, and I was wondering how to achieve the best image quality for challenge submission. I've read that people use a iterated upsampling of 105-110% at a time to enlarge an image. Is that also the "proper" way to downsample an image as well?
So if I start from my camera native (or large crop) resolution, should I decrease the overall image size one small step at a time until I hit 640 on the longer side, or is that just making life hard for no reason at all? :^) |
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05/08/2004 04:40:43 PM · #2 |
The reason for upsizing in small increments in to avoid pixellation. When upsizing, the software has to create information that was never recorded by the camera. When downsizing, this is not an issue, so the stepped resizing is not necessary.
In other words, it's safe to downsize in one swell foop. ;-)
-Terry
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05/08/2004 04:40:49 PM · #3 |
| Save for web seems to be the most popular way to downsize. Bring the largest size to 640 pixels and move the quality bar until it goes below 150kb. |
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05/08/2004 04:44:00 PM · #4 |
Just go to Image Size and change the largest dimension to 640 pixels. Apply Unsharp Mask if necessary, then go to Save for Web and bring the Quality slider down until you get under 150kb. I don't think sampling down in increments serves any purpose since the pixel information already exists.
EDIT: Geez... I gotta type faster!
Message edited by author 2004-05-08 16:44:38. |
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05/08/2004 05:13:15 PM · #5 |
| WOW! Thanks for the supah-speedy replies. I'll check out the Save for Web feature after my CF card empties out (busy day at the zoo...) |
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05/09/2004 01:12:31 AM · #6 |
yay... :D thankyou
I've been having real trouble resizing using MS photo-editor.....specially with anything with fine lines. Have just used the save to web for the first time and it works :D took this pic of a praying mantis which needed resizing.....everytime I tried ended up with crinkled antenae
sue |
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05/09/2004 05:49:44 AM · #7 |
In Photoshop CS you resize using Bicubic Sharper/Soften. This avoids the need for the tedious 5% resample (interpolation) method.
Taken from another thread, and I think originally from the Photoshop CS documentation
Photoshop CS provides two new interpolation options that will produce better results when you increase or decrease the number of pixels in an image. Bicubic Smoother will produce smoother results when enlarging an image and Bicubic Sharper will preserve more detail when you reduce an image in size. These interpolation methods will produce results as good as if not better than using what was known as the 'step interpolation' method and more quickly too.
Message edited by author 2004-05-09 05:52:34.
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05/12/2004 01:54:31 PM · #8 |
Does anyone use Photoshop's resize wizard to make images suitable for posting here? That's what I tried and nothing came out quite the way I wanted it to. What a pain!!
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