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What is less Lossey? PNG or JPEG?

Anubis

Anubis

No Lifer
im guessing JPEG but id like to know, im need to upload a pic to a online printer and the uncompressed TIFF is 312megs, ao i need to compress it, but IDK if jpeg will cost me too much info
 
20x30 is the resolution 16bit tiff file

how do i do loseless PNG? photoshop gives me the option for interlaced and non interlaced PNG when i save as
 
Holy God. Is that the Earth Pic? It hought it was bigger. I'm pretty sure I have it on CD somewhere.
 
I've no experience with png .. last I looked at it, it was a third party browser plugin and only used for vector art such as webpage buttons.

I don't get it. Even if you are using CMYK, that open file should only be like 216MB, and that's at 300dpi, which is unnecessary for that size print.

Also, how did you get that size file? Drum scan? I *know* you didn't arbitrarily scale up a digicam pic in pshop 😛
 
Originally posted by: myusername
I've no experience with png .. last I looked at it, it was a third party browser plugin and only used for vector art such as webpage buttons.

I don't get it. Even if you are using CMYK, that open file should only be like 216MB, and that's at 300dpi, which is unnecessary for that size print.

Also, how did you get that size file? Drum scan? I *know* you didn't arbitrarily scale up a digicam pic in pshop 😛
Click to expand...

PNG has never been a vector image format. It's a LOSSLESS bitmap image format. JPEG is NOT a lossless format:

Therefore, PNG is less lossy than JPEG.
 
Hmm. Whatever format I was remembering scaled and was being used for buttons and such, so I guess it wasn't .png

At any rate, the .png page lists compression of large files at 5-25% It would seem to make more sense to save as a .jpg which would offer more than 50% on the *low* end.

Obviously you wouldn't archive the file this way, but for printing, it would be suitable to save as jpeg, possibly even at less than the minimum compression/maximum quality setting.

 
You need to compress it, but everybody is telling you to use the lossless png format. 😕

Both jpeg and gif give you many compression options. I'd use jpg, but you can experiment for a while and see which works best, by using the Save For Web option on the file menu of PhotoShop.
 
Originally posted by: Ornery
You need to compress it, but everybody is telling you to use the lossless png format. 😕

Both jpeg and gif give you many compression options. I'd use jpg, but you can experiment for a while and see which works best, by using the Save For Web option on the file menu of PhotoShop.
Click to expand...

His title did ask "What is less lossey"...
 
Originally posted by: Ornery
Guess you should have suggested he leave it as a TIFF then, eh? :roll:
Click to expand...

Not really... since PNG is loseless it would look the same, however it would be a smaller file size.
 
Originally posted by: Ornery
You need to compress it, but everybody is telling you to use the lossless png format. 😕

Both jpeg and gif give you many compression options. I'd use jpg, but you can experiment for a while and see which works best, by using the Save For Web option on the file menu of PhotoShop.
Click to expand...
GIF is crap for photos. Also, he asked which was more lossy, not which one he he should actually use.
 
Originally posted by: Ornery
JPG or lossless for image archives?
  • Let's compare lossless PNG and lossy JPG at the same file size. How well does JPG stack up now?

    At the same file size, JPG can support a much higher resolution scan.
Click to expand...
It's all about what you need. JPGs are fine for when the lossyness isn't a problem(which is 99.9% of the time), but when you're trying to do precision stuff(like image quality comparison for video cards), you want PNG. In Anubis' case, he's obviously worried about quality, so lossless PNG is probably the way to go.
 
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