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I have strange digital image file size problems. For example, if I upload a 6 mb file to my photo sharing website (Google Picasa) at the highest resolution, it will indicate that it is only 1.8 mb. After downloading the same file from the website, it indicates that it is 1.8 mb, however, the dpi and size of the image in inches, in Corel Photopaint, multiplies out to be the same as the original (96 dpi x 38.67 in vs. 72 dpi x 29 in), and when I resave the jpg with Photopaint, the file size increases to 5 mb. What is going on? Thanks, Tom

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  • tomporter Oct 07, 2008

    Thanks Steve5. I guess I still do not understand the math. My SD card is 8 Gb (8,000 mb), and the camera indicates that it can hold about 1,100 images, which works out to about 7.3 mb per image. I understand that jpgs are compressed compared to RAW files, but it seems about right that my jpgs would be about 6 to 7 mb each to fit that number on my card. So Picasa must further compress them (even though I upload at the highest resolution, which I think should be at the original file size) to 1.8 mb. However, Corel Photopaint uncompresses the file and adds back about 3 mb of information?



    If all jpgs are compressed, why don't the original jpgs on my card, which are about 6 mb, open up even larger than 6 mb in Photopaint? When they are reduced to 1.8 mb by Picasa, is there some information encoded in the file that tells Photopaint that the file should be larger?

    Thanks for your help!

  • tomporter Oct 07, 2008

    I have a new Nikon D90, which is 12.3 megapixels. I am capturing in jpg format, so I assume that the originals are actually already compressed compared to RAW format.

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Hey Tom; this always hurts my brain, but here goes. Your image file is 6mb. That's the easy part. When it is saved in the .jpg format, it is "compressed" in order to store more images on a memory card or hard drive or CD etc. . Otherwise the sheer size of digital images would only allow a few on a memory card before it was full. Your 1.8 mb file size is the compressed size. When you open the file it is uncompressed to its proper dimensions. The amount of compression is usually chosen to optimize its use. For instance Picasa has to store so many images, it may compress them more than another application. Each time you open, make any changes, and re-save the same image, a small amount of data is lost or destroyed (that may explain why they open up to 5mb in Photopaint). The less compression used, the more "true" the image remains. Most cameras compress the images to about 1/4 their expanded size. That's how a 1gb memory card can hold hundreds of 6mp images, when it could only hold about 170 if they were uncompressed. I hope that helps a little.

Posted on Oct 07, 2008

  • Steve Grezoux
    Steve Grezoux Oct 07, 2008

    I'm curious as to what camera you are using, and are you shooting in raw, by any chance? If your camera is 6 megapixels, those files, as jpgs, should be about 2mb in size. Steve5

  • Steve Grezoux
    Steve Grezoux Oct 07, 2008

    Another thought here is that when you upload your 6mb image to Picasa, you are actually uploading the jpg, which is the compressed version of your 6mb original. It looks like it's compressed to about 1/3 of its original size. Steve5

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