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Photoshop compression

post #1 of 11
Thread Starter 
Hey guys sorry if this is the wrong forum but does anyone know how to make Photoshop compress images better without lowering the quality? I took a 32kb image, edited it a little in Photoshop and saved it as a JPG at the highest settings and it came out to 125kb. A trick I discovered awhile ago is if I then open the new image in Jasc Paint Shop Pro and do nothing to it but click the save button, it will compress it much better without lowering the quality at all, and in this case the 125kb image became 46kb.

This is obviously a waste of time though and it would be better if Photoshop could just do all this itself. Does anyone have any advice?
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post #2 of 11
Save as a TIF file.
post #3 of 11
Thread Starter 
Quote:
Originally Posted by sub50hz View Post
Save as a TIF file.
Why would I do that? TIFs are even larger and the purpose here is to make it smaller.
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post #4 of 11
You can't have both. Choose file size or image quality.
post #5 of 11
What type of image is the source? What are you using it for?

Have you adjusted the compression ratio?

Have you exported for web devices?
    
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post #6 of 11
Thread Starter 
What I'm trying to do here is to save a batch of images to be used in an Android app, so to keep the app filesize low I want each image to be compressed as much as possible, but to retain as much of its quality as possible. When I compare Photoshop's 125kb file to Paint Shop's 46kb I can't even tell the difference. So I'm not sure if Photoshop itself just isn't that great at saving files or if Paint Shop actually is lowering the quality but the difference is just too small to notice, but I'm using a 30" monitor and I assume if the smaller file actually had been dropped to 1/3 of the original quality I'd be able to notice. I'm not exactly sure what the best way to do this would be because even 46kb is quite large when you think about having hundreds of images. The source images are JPGs and I'm cropping/resizing them to 480x730px at 72dpi.
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post #7 of 11
What % compression are each at, have you adjusted that compression?

Unless they've removed the feature, use the "Export for web devices" option, which has significantly reduced file size and a 4-up window to compare compression settings in real time.
    
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by _02 View Post
What % compression are each at, have you adjusted that compression?

Unless they've removed the feature, use the "Export for web devices" option, which has significantly reduced file size and a 4-up window to compare compression settings in real time.
Thanks, export for web made it a lot easier to see the differences. While they are noticeable, I can probably get by with the 25% option because they'll be viewed from a tiny phone screen anyway.

I also thought it was interesting how if you compress an image that's already not-too-great-quality, instead of becoming horrible quality it actually looks about the same (like a facebook picture or most images saved off the internet).
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post #9 of 11
Thread Starter 
Managed to get them down to about 13k so the app size will be less than 4mb, which isn't bad.
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post #10 of 11
Thread Starter 
If I have a bunch of invisible layers underneath the visible layer, will that affect the JPG output size? I tested it a couple of times and it looks like the answer is no, but want to make sure.
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