Reduce file size.

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cargo

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Name
Gary
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Hi all.

Can someone please help me to reduce my file size from 28mb down to below 25mb without loosing or loosing as little quality as possible. I am using cs5.

Gaz
 
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When your camera offers it, there is the option to save your RAWs as
lossless compressed files! …this is the only place I would attempt such
a file size reduction.
 
Jayst84 said:
What's the purpose, and what are you doing with the file at the moment?

I'm guessing it's to submit to something, or upload somewhere. That would usually mean JPEG, and 25mb is a bloody big JPEG.
Click to expand...
Sorry it was late when posting yes it is a jpeg and yes I want to upload to a site there limit is 25mb. Large file as it is a stitched photo.

Gaz
 
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Start fist by adapting for file to the final media or use resolution wise.
Then, set an acceptable viewing size where length and width will reflect the original ratio.
Finally, one my consider increasing compression to bring the file size to required final size.
 
I leave the jpeg compression set to the highest quality which is 12 off memory.

Gaz.

I am off to work in a mo so will reply this evening if you guys n gals reply !
 
There are a few ways you can do this depending on requirements. Generally a slight reduction on the quality slider when saving will reduce the file size enough. Always save from the source though, don't continually save jpeg to jpeg as that degrades quality ime. fwiw using a quality option of 10 or 12 makes no discernible visible difference to IQ all it does is inflate the file size. Even 8 gives very good IQ again extremely hard to tell the difference between 8 & 10 ime.
 
Ok Paul. So I would do this from the psd file then and not the jpeg as the former as not been reduced I assume.

Gaz
 
Yes, always re-save as jpeg from the psd file - I'm sure there are technical reasons why jpeg to jpeg saving degrades IQ and I suspect it is to do with the way jpeg compresses data (i.e. chucks some away ;)) - but when I have done this a few times the resultant file is pretty poor IQ wise. So yes, always go back to the psd and save from there. You can specify different names when saving.
 
Thanks James Paul and everyone else for helping me out with this. I will try this later.

Gaz
 
If you use the Save As option and choose JPEG from the options, you'll see a slider labelled Quality (IIRC). If you tick the preview box, you'll see the file size. If you zoom in on a critical part of the image before selecting Save As, the preview button will also show you what effect the compression is actually having on the final image. A first generation JPEG save from the original will show almost no degradation at a level of 10 and a print from a level of 8 will probably be indistinguishable from higher values.
 
Nod said:
If you use the Save As option and choose JPEG from the options, you'll see a slider labelled Quality (IIRC). If you tick the preview box, you'll see the file size. If you zoom in on a critical part of the image before selecting Save As, the preview button will also show you what effect the compression is actually having on the final image. A first generation JPEG save from the original will show almost no degradation at a level of 10 and a print from a level of 8 will probably be indistinguishable from higher values.
Click to expand...
Thats sounds just the ticket. Thanks

Gaz
 
Done the above and saved as jpeg from the psd at a quality setting of 11, which is one mark down from max. Knocked the file size way down from 28mb to 15mb.

Thanks again.

Gaz
 
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