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08/15/2005 10:54:23 PM · #1 |
When resampling to create large print images, what format is it best to use? Is it better to do the resampling in your native image format (say .psd) and then convert to the required format (say tiff or jpg) at the end or convert first and then re-sample? Or does it not matter a damn.
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08/15/2005 10:55:30 PM · #2 |
I would say you'd get better results from the best quality image all the way through to the end where you'll lose a little. better not to lose a little and then blow up the negative effects?
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08/15/2005 11:27:54 PM · #3 |
| It makes no difference as long as you use an uncompressed format. I usually do all my editing first except for Unsharp Mask, then save a flattened TIFF file to which I apply sharpening, or resize and then sharpen. |
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08/15/2005 11:56:40 PM · #4 |
| I think that if you work out the math, then resampling in 16 bit mode should give better results than doing it in 8 bit mode. But the difference may be insignificant for all I know. |
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08/16/2005 01:40:57 AM · #5 |
| I would avoid JPG. It seems to degrade a little every time you save. |
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08/16/2005 04:33:48 AM · #6 |
| If you convert to a lossy format (i.e. jpg), you will lose a tiny amount of quality from the compression, but for a single save-load-save cycle, the artifacts probably won't be visible. Your ideal transformation sequence is indeed to have a 16-bit psd as a starting point, transform, then export, but you may not be able to tell the difference if you went to 8-bit jpg first, as the 8-bit/16-bit difference will only affect the precision of calculating the color of downsample pixels that would end up in the same position as two pixels from the high resolution image (which is exceedingly unlikely to produce any posterization lines under the worst of circumstances), and as I mentioned, one extra generation of jpg artifacts probably won't be noticeable either. |
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