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05/02/2004 02:15:25 AM · #1 |
how does one reduce a photo without too much jpg compression.
dont understand.
must one shrink it in tiff or something?
also when taking the shots I have my camera on 'normal' cos i get
more shots, is this the wrong way to go?
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05/02/2004 02:23:56 AM · #2 |
your shot already has too much jpeg compression, or you are seeing the jaggies after you compress? What software are you using?
Always, always take your pictures at the best quality your camera will allow.
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05/02/2004 02:32:48 AM · #3 |
ok this is the comment i got from the latest challenge.
too much (JPEG) compression. only about 80K, so you had plenty of room for lower compression / better image quality. also, lighting is not very good. colors look flat. Nothing seems to be in focus, but that may just be because of the overcompression.
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05/02/2004 02:52:26 AM · #4 |
ok, you are allowed 150k file size for your contast submissions. now based on what you said about your camera, you are trying to take lots of pictures, and leaving file quality behing in the meantime. Take big pictures, so that you can print on those occasions when you capture something good. If you are only taking little pictures, so you can take lots, you are saying that you are only interested in sharing fotos for the web.
If your using photoshop, and you're done with everything that you want to do, resample your shot to 72dpi (its probobly already there). Then set your longest pixel dimension to 640 (the largest allowed at dpc). Save for web. In the save for web screen, select jpeg maximum. read your file size. if your more than 150k, use the slider to reduce to the first setting that gets under 150k. |
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05/02/2004 05:20:52 AM · #5 |
take the best quality pic your camera will allow. Buy a bigger or another memory card if needed. you can always reduce a pic in size or quality, but if the info is not captured to begin with there is now way to add it.
When editing, if you cannot finish it then save the work in progress as a TIF. There is no compression so there is no data loss or loss in quality.
If using PhotoShop and saving the final pic as a JPG, try not o compress below 8 (on a scale of 1 to 12). I start with a 2.3M jpg (2048x1538 or so) and once I am done editing, i take the long side and resize the image to 640 pixels on that side, teh other side being whatever it happens to come out to. I rarely compress below 10 to get a 150k file for upload. Compressing more will begin to hurt the image quality.
As to DPI settings, they do not matter unless you are printing the image. The malarkey of 72dpi for screen display is BS - 640 wide is 640 wide. When you print it, then you have 200 dots per inch at the printer, so then 640 at 200 dpi is about 3 inches. so then it matters. see
scantips.com for a complete understanding of this.
as to your focus, flat color, etc - most likely it has nothing to do with the compression. You should set your camers to NO sharpening and then sharpen AFTER resizing to the final out pust size (640x whatever pixels) using UnSharp Mask (USM).
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