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| Thread ID: 36465 | 2003-08-11 03:10:00 | C F Settings - Digital Cameras | willbry (1555) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 166709 | 2003-08-11 03:10:00 | To get best quality images for printing a friend tells me not to bother with high compression settings. He said use the lowest available as it has little bearing on quality but on the other hand set the resolution as high as possible. He said this will give you a very large image which can then be shrunk for emailing and for printing. You can come down but you can't come up. Can anyone confirm this as my Canon S30 manual says quite clearly " Select Superfine [ as opposed to fine or Normal} compression for a "higher" quality image. | willbry (1555) | ||
| 166710 | 2003-08-11 03:35:00 | It is quite hard to get one's head around these things but Frog Prints have good explanations here (www.frogprints.co.nz) and here (www.frogprints.co.nz). | tommy (2826) | ||
| 166711 | 2003-08-11 03:47:00 | You can't replace what you didn't have to start with, so go for the highest resolution, and then (if you have the storage available on your card), go for the lowest compression. If you have to trade something off (because of storage requirements), you then should raise the compression, and as a last resort, lower the resolution. Also, with jpegs, if you edit them on your PC, limit the number of times you edit / save / re-edit a file, as each time you save the file, it will reapply compression to an already 'compromised' image; compounding the picture information loss. A bit like photocopying a photocopy - it just gets worse :| |
wuppo (41) | ||
| 166712 | 2003-08-11 04:25:00 | Exactly. JPEG (Joint Photographic Experts Group) compresion is "lossy". "Superfine" will be less compressed (therefore with least loss of information) than "fine" or "normal". So it will keep "higher" quality. As the memory cards get cheaper, it will be less of a problem. |
Graham L (2) | ||
| 166713 | 2003-08-11 05:00:00 | That's good information wuppo, I have been wondering about this as well. > Also, with jpegs, if you edit them on your PC, limit the number of times you edit / save / re-edit a file, as each time you save the file, it will reapply compression to an already 'compromised' image; compounding the picture information loss. The information loss would not occur (or be minimised) if one saved the .jpeg file to another format, eg .psp (PaintshopPro) prior to editing and saving, would it? I normally do this then export the .psp file to .jpg again when finished. What would view be on that? |
Fire-and-Ice (3910) | ||
| 166714 | 2003-08-11 05:07:00 | I always shoot in the highest quality (lowest compression) jpg available, and keep these originals on my PC, or backed-up to CD. Any image I print out has usually been processed in Photoshop and I always save it in a non-lossy format, like Photoshop's own .psd or say .tif, and work with that. Hard drive sapce, memory cards, CD-Ws etc are all so scheap now I value the best quality image more than saving space (with the excaption of shooting straight to uncompressed .tif or .raw on the camera, which stills take sup too much sapce on my card). My 128MB CF card cost about $150 and lets me store 82 jpgs at 3.3 megapixel, low-compression high qulaity setting son my Coolpix 880. Spending that $150 is much more prefearble to having crappy looking high-compression jpgs - and the degradation in image quality IS very noticeable if you save low-quality jpgs. |
Biggles (121) | ||
| 166715 | 2003-08-11 05:09:00 | >>The information loss would not occur (or be minimised) if one saved the .jpeg file to another format, eg .psp (PaintshopPro) prior to editing and saving, would it? I normally do this then export the .psp file to .jpg again when finished. What would view be on that? As long as you select uncompressed in the options for the PSP format files, you will retain maximum picture info. Commonly, people use uncompressed tiff files for best image quality, although the size can get quite exciting. :| |
wuppo (41) | ||
| 166716 | 2003-08-11 05:32:00 | Thanks to everyone for your imput and for confirming the information I was given. Of course with uploading images for processing I have to keep them in a compressed form [ jpg] as you'd never finish the exercise with tif files. By the way Bruce I bought a 128 M CF card in Switzerland about 3 months ago and it converted to NZ92 when I got my visa bill so if anyone's going to Europe don't buy your CF card here. | willbry (1555) | ||
| 166717 | 2003-08-11 05:34:00 | Thank you wuppo, that makes sense. Yes, file sizes certainly become rather alarming when one starts looking at the size of folders full of pictures. :D | Fire-and-Ice (3910) | ||
| 166718 | 2003-08-11 05:51:00 | CD-W drive - the digital photographer's best friend (well, next to a big hard drive, and a big memory card, and a really good cmaera, and Photoshop or Paintshop Pro, and ...) | Biggles (121) | ||
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