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Jpeg Compression.


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I have used both FW and PS extensively to compress images (more specififcally GIF and JPG) and there is little to no difference between the two in quality or file size. I prefer FW for GIF compression as its interface to edit the color palete is better, but for JPEG there is little to difference with JPG.

 

As an aside, while I save my rendering work to TGA or TIF, when I send my work to the printers they require the files to be sent as a JPG with a compression of 12 (lowest) and there is no difference between that and a uncompressed TIF on any of the digital outputs I have sent through. They print on a $500K KODAK Professional RP 30.

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I have used both FW and PS extensively to compress images (more specififcally GIF and JPG) and there is little to no difference between the two in quality or file size. I prefer FW for GIF compression as its interface to edit the color palete is better, but for JPEG there is little to difference with JPG.

 

As an aside, while I save my rendering work to TGA or TIF, when I send my work to the printers they require the files to be sent as a JPG with a compression of 12 (lowest) and there is no difference between that and a uncompressed TIF on any of the digital outputs I have sent through. They print on a $500K KODAK Professional RP 30.

 

if you are not careful, you are ging to open the tif vs jpeg quality conversation again.

 

when i was on dial-up about 3 or 4 years go i spent time comparing Fireworks and ImageReady. i found that under the same compression settings Fireworks gave slightly smaller files, and they looked slightly better than the ones compressed with ImageReady. ...and when i say a slightly smaller file size with Fireworks, I am talking maybe a 31k file vs a 33k file. i was on dialup, so that small of a difference mattered in my opinion.

 

but like i said, that was 4 years ago, and both are several versions more mature now.

 

...also, if you are compressing for web, you shouldn't do that directly in Photoshop. i think there is extra information in files that is stripped out when you use a web image compression software vs a photo editing software. also the web compression software gives you an interactive preview ont he compression. although i am pretty sure that you meant you were using ImageReady and not Photoshop, so you know what i am talking about.

 

also... apparently there is a group in Europe somewhere that are trying to copyright GIF. http://burnallgifs.org/archives/

 

also... weren't both of these formats supposed to start to fade away in favor of PNG files anyway?

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although i am pretty sure that you meant you were using ImageReady and not Photoshop

 

There is the Save for Web module within Photoshop itself that is very quick and useful for website, or smallish preview, images.

 

It doesn't like really large size (4000-6000+px) image files much, although I have sometimes let it struggle with them, just to see if it can.

 

The other thing is, I don't think that the Save for Web module includes the colour profile in the jpg file, so if you want that included, I think you have to do a normal Save As...jpg.

 

Not sure if ImageReady (or Fireworks?) will include the colour profile in jpgs either. Never heard of ACDSee, but it sounds like a PC thing, and I'm on a Mac.

 

D.

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There is the Save for Web module within Photoshop itself that is very quick and useful for website, or smallish preview, images.

 

It doesn't like really large size (4000-6000+px) image files much, although I have sometimes let it struggle with them, just to see if it can.

 

The other thing is, I don't think that the Save for Web module includes the colour profile in the jpg file, so if you want that included, I think you have to do a normal Save As...jpg.

 

Not sure if ImageReady (or Fireworks?) will include the colour profile in jpgs either. Never heard of ACDSee, but it sounds like a PC thing, and I'm on a Mac.

 

D.

 

didn't realize save for web was there. i always thought photoshop used ImageReady when you saved for web. guess i was wrong.

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I prefer ACDSee over Photoshop for converting tga to jpg. I like the quality better.

 

Fran, are you kidding me?! ACDSee has the worst Jpeg compression setting ever. I tried it many times, each time it give me the worst result ever (jpeg block artifacts, image color distortion)

I too have spent time doing extensive test on JPEG/GIF compression and I agree with Crazy hobo (haha) that FW is slightly better if you have the time to fine tune your graphics. It just give it slight 1-2k edge if you are optimising your graphics for low bandwidth web delivery.

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Fran, are you kidding me?! ACDSee has the worst Jpeg compression setting ever. I tried it many times, each time it give me the worst result ever (jpeg block artifacts, image color distortion)

 

Maybe you were doing something wrong then. :rolleyes:

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