Photoshop CS – WinXP jpeg image size puzzle

S
Posted By
Slistress
May 11, 2004
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353
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4
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Closed
I could not find any threads on this here so presume this is a ‘me only’issue.

I recently did some scans direct to jpg with minimum compression as they were not going to need any other action. One turned out to need some tweaking so I opened in Photoshop and saved it with low compression. The file grew considerably in size, 5 or 6 times larger. I did not think to much of that as I was busy and used some other software to do it.

Today I received a bmp that needed to be trimmed adjusted to 200×200 and saved as a jpg (24 bit colour). The bmp was 272K and trimmed and resized resulted in a 116k bmp. Saved as a jpg with low compression I got a 48k jpg! I new that was much too large and had some spare time. Even on max compression with no preview the file only shrunk to 47k.

I then put the same bmp into Corel Photopaint and saved as a jpg with a low 7% compression giving an 18k jpg. With 10% compression it got down to a reasonable 14k.

What is going on in Photoshop????

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DM
Don_McCahill
May 11, 2004
To get minimum jpg size, you should use "save for web". It provides the smallest jpgs. (I think there is some header info saved if you make your jpgs with Save As.)
HD
hot_denim
May 11, 2004
Percentages for JPEG compression are not within the same RANGE of the ACTUAL JPEG compression betweeen applications. I.e. is JPEG gives 1-200 divisions. then Photoshops 1-100% could be 100-200, and Photopaints could be 1-100.
L
LenHewitt
May 11, 2004
What is going on in Photoshop?<<

At a guess, you are saving not only the image data but quite a lot of meta-data too, including the icc profile.

As Don says, use Save for Web for small file sizes
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Slistress
May 12, 2004
Thanks – problem solved. This sould be covered in the manuals!

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