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File Size Conformity


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Mark Tompson

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Is it possible to make multiple photos conform to the same file size? For example, let's say you load 10 RAW photos into Photoshop and then use an action to re-size them to specific resolution and save them in a compressed format such as JPEG. Is it possible set the compression to save them all as the same file size when compressed? (in other words, the compression would be figured by target file size, instead of by a desired quality level) Using the example, this would produce ten different images each with the same resolution and the same file size. Possible?
 
you can do it via batch process in photoshop or Bridge.

First open up an image you want to resize, press record under a new action resize it and save as jpeg or whatever then file close. Stop your recording

Put all your images in the same folder you probably wont be able to do it with raw so you may need to convert them all to jpeg first.

Go to file >automate>Batch select the action you recorded then the folder with your images in and it will ask you where you want to save the output files. if you have 200 images start it off and go make a cup of coffee lol.
 
Thanks for your quick reply, but what I was really curious about isn't so much the image resolution but the actual file size (data size). In other words, is it possible to save two different images (in a compressed format) and end up with the same file size; for example, each image would be exactly 5 megabytes.

Because jpegs are lossy file size can vary substantially depending on the content of the image, can I set the compression to target an ideal file size rather than quality?
 
At first I was going to say no to your question, but it turns out that I would be wrong. Photoshop can do this by way of the Save For Web and Devices dialog box. Here's an article explaining how. Amazing, as much as I think I know about Ps, the more I find I don't know about it. Very good question here Mark, we both learned something. Just tried it on my avatar image and it does in fact work. The image went from 46K to 31K. :thumbsup:

http://www.planetphotoshop.com/let-photoshop-make-the-file-size-call-2.html
 
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Thanks for the reply Chris. I figure there had to be some way to do it: how could Photoshop overlook something like this, you know? But I didn't think about looking under the web settings. Many thanks for pointing me in the right direction.
 
Sorry I misunderstood what you were asking but looks like Chris has sorted you out good Job
 
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