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Photoshop CS Question

 
 
Steven Wandy
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      01-06-2004, 10:01 PM
I just got the Olympus E1. When I shoot in highest quality JPEG the files
sizes are usually between 3 and 4 MB. I open the images in PS-CS, do
whatever I wish to them and resave as JPEG at highest quality level (12).
The resulting images are usually between 5 and 6 MB.
(1) What is the reason for the increase?
(2) Would it make more sense to lower the quality of the level that PSCS
saves the file in to get back to around the original size?
Thanks


 
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Stephan
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      01-06-2004, 11:22 PM

"Steven Wandy" <(E-Mail Removed)> wrote in message
news:CeGKb.168891$(E-Mail Removed)...
> I just got the Olympus E1. When I shoot in highest quality JPEG the files
> sizes are usually between 3 and 4 MB. I open the images in PS-CS, do
> whatever I wish to them and resave as JPEG at highest quality level (12).
> The resulting images are usually between 5 and 6 MB.
> (1) What is the reason for the increase?


Probably a different way of compressing, not sure.

> (2) Would it make more sense to lower the quality of the level that PSCS
> saves the file in to get back to around the original size?


Not at all, why would you want to degrade your pictures?
Jpeg is for web, save your pictures as Tiff.

Stephan


 
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mdavis
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      01-07-2004, 02:00 AM
I'm not familiar with the E-1, but I suspect the maximum JPEG being used by
the E-1 is lower than 12. Try loading the image into PS CS and immediately
click on "Save As" and see what the JPEG offering is in the window.


 
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Dr. J. Smith
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      01-07-2004, 02:16 AM
> > (1) What is the reason for the increase?

The original files are compressed more. To compare, in the PS save dialog
they'd probably be in the 'high' range as apposed to the 'maximum' range
that you're resaving them in. I guess it saves space on your camera card.

> (2) Would it make more sense to lower the quality of the level that PSCS
> saves the file in to get back to around the original size?


Is there a reason you want to get it back to the original size? To be clear,
the original size (pixel x pixel) of the image doesn't change, just the
amount of disc space it takes up does.

As for your question, it depends. Jpeg is a lossy format and as such is best
used to save disc space (or bandwidth) only AFTER you are completely done
editing. Every time you open a jpeg image, make changes and save it again
(recompress it) as a jpeg you will lower the quality of the image. Tiff is
probably the most widely used lossless format and will allow you to save
layers and masks though this will increase its size on disc. As well tiff
can use LZW compression to lower it's size which works to varying degrees,
usually.


 
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Dr. J. Smith
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      01-07-2004, 02:26 AM

"mdavis" <(E-Mail Removed)> wrote in message
news:EKJKb.216$(E-Mail Removed) y.com...
> I'm not familiar with the E-1, but I suspect the maximum JPEG being used

by
> the E-1 is lower than 12. Try loading the image into PS CS and

immediately
> click on "Save As" and see what the JPEG offering is in the window.
>
>


Does the dialog box not offer up the last used setting?


 
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AKsteve
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      01-07-2004, 08:12 AM
Sounds like you are saving these for web viewing. If you want to print them
it would be better to save them as tiffs - file size will be much larger but
quality will be better.

Anyway, I would suggest using the "save for web" command under the file
menu. Once there, you can mess with the jpg settings to get the size and
quality you want.

Steve

"Steven Wandy" <(E-Mail Removed)> wrote in message
news:CeGKb.168891$(E-Mail Removed)...
> I just got the Olympus E1. When I shoot in highest quality JPEG the files
> sizes are usually between 3 and 4 MB. I open the images in PS-CS, do
> whatever I wish to them and resave as JPEG at highest quality level (12).
> The resulting images are usually between 5 and 6 MB.
> (1) What is the reason for the increase?
> (2) Would it make more sense to lower the quality of the level that PSCS
> saves the file in to get back to around the original size?
> Thanks
>
>



 
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mdavis
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      01-07-2004, 01:13 PM
Sure, but the bottom of the window will give you the filesize for
comparison. You can switch JPEG compressions settings and see what is
closest to the JPEG from the camera for the unaltered image.


 
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Stephan
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      01-07-2004, 07:42 PM

"AKsteve" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Sounds like you are saving these for web viewing. If you want to print

them
> it would be better to save them as tiffs - file size will be much larger

but
> quality will be better.


No, you won't see a difference when you print.

>
> snip<


Stephan


 
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