Reduction in file size

T
Posted By
Tantris
Jan 16, 2007
Views
360
Replies
8
Status
Closed
I have file sizes ranging from 14mb (raw files in .cr2 format), to 275mb (scans of large format negatives in .psd format).

What I would like is to generate a JPEG file, probably between 150 – 300 kb in size, which is of sufficient quality to display on a website. I’m finding it difficult to do this satisfactorily. For example, the ‘save for web’ option doesn’t work effectively, particularly with the larger file sizes.

Is there an easy solution?

TIA, Tantris
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JJ
John Joslin
Jan 16, 2007
Consider the websites are viewed in browsers on monitors.

We can assume the average browser window is 600 to 1000 pixels in width.

You need to reduce your images to say 800 pixels across (Image > Size) then use Save for Web, which will set them to 72 pixels per inch.

When you close the file, DON’T save the changes of course!
T
Tantris
Jan 16, 2007
John — thanks, I will try that.

I’m just beginning to get serious about a digital darkroom, and finding my technical limitations very quickly!
SF
Scott_Falkner
Jan 16, 2007
You can resample in Save for Web without going to Image > Image Size and resampling there. Unfortunately, Photoshop (and Illustrator) don’t have a way to save resampling presets in the Save For Web dialogue. Bloody foolish feature to overlook, but there you go.
JJ
John Joslin
Jan 16, 2007
Scott

How do I change the pixel dimensions in Save for Web if the image is huge to start with?

Just resampling to 72ppi is not the answer.
KV
Klaas Visser
Jan 16, 2007
How do I change the pixel dimensions in Save for Web if the image is huge to start with?

In CS2, there is a tab in the Save for Web window called "Image Size" which allows you to change pixel dimensions, or use a percentage, and to select the resample quality.
JJ
John Joslin
Jan 17, 2007
True!

I forgot that little tinker because I never use it.

I like to see what I’m doing I guess
KV
Klaas Visser
Jan 17, 2007
I like to see what I’m doing I guess

Well, there is a preview, so that you can see the effect of the resample, before committing to it.
JJ
John Joslin
Jan 18, 2007
Maybe I should give it a try!

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