On 2/20/07, Chris MacKenzie <[EMAIL PROTECTED]> wrote: > I am doing a vast amount of work in photoshop cs2 and then resizing images > into multiple sizes for email, web publication, printing out on A3, A4 > etc,etc. To date I have been using PhotoShop actions which is a real pain.
> My Question is will resizing in PIL reduce the image quality compared to CS2 > or will it remain the same as the CS2 output. I'm not a hard-core pil dev/user, but I've been in the same boat as you, so here's my thoughts: With Photoshop you'll be working from high-res, lossless files (PSDs). If you were to save them out as a high-res jpg and then resize that into smaller files with PIL, you'd definitely loose some quality, since PIL's source material (JPGs) will be of lower quality. If you give PIL a non-lossless format, like 24/32b PNGs and you resize to even multiples of the source image's size (for example, 800x600 --> 400x300 --> 200x150 --> 100x75) I suspect you'd get pretty similar results. Where Photoshop shines, in my experience, is: * resizing to non-even multiple of source image's size (800x600 --> 90x68) * using masks to define different compression ratios for different parts of the image * choosing the best compression ratio to match your desired output size/quality This is just a guess though. Since Photoshop is a proprietary program, no one outside Adobe can be confident about what goes on inside its "save optimized" code. Maybe PIL can do better! Also, different types of photos may be affected differently by the various programs. Line-art may look rotten and photos may look superb. You could batch them and then fix up anything that doesn't look good enough. By the way, I'm surprised you felt using actions a pain... don't you just drop a folder of images onto your action's "droplet" .exe file? I don't use cs2, so maybe they've taken droplets out. -- Matthew Nuzum www.bearfruit.org newz2000 on freenode _______________________________________________ Image-SIG maillist - Image-SIG@python.org http://mail.python.org/mailman/listinfo/image-sig
