Need to be SCHOOLED

Art ScottArt Scott Registered Users Posts: 8,959 Major grins
edited November 26, 2010 in The Big Picture
Ok...been woring on some images and saved to my hdd.....all normal so far.....
But when I rt click on some of the images (rt click click on properties) win (7) says it is only 1.7B......however PS (image size) says the image is 20+MB.......it is an 8x10 at 300dpi and i saved it in PS (save as) number 12 jpg

This is the 1st time I noticed it.......I think....well been up since 6am gotta get shut eye now.

A great many Thanks
"Genuine Fractals was, is and will always be the best solution for enlarging digital photos." ....Vincent Versace ... ... COPYRIGHT YOUR WORK ONLINE ... ... My Website

Comments

  • WillCADWillCAD Registered Users Posts: 722 Major grins
    edited November 26, 2010
    Maybe you're just misreading it, Art. Windows might be telling 17mb, not 1.7b. 17mb is close enough to 20mb that the difference could be in how the two count; Windows may consider a mb to be 1024kb, etc, while Photoshop may be counting a mb as 1000kb like a hard drive manufacturer does.

    You'll have to take another look when you've had some shut-eye to confirm or debunk this hypothesis.
    What I said when I saw the Grand Canyon for the first time: "The wide ain't wide enough and the zoom don't zoom enough!"
  • SamSam Registered Users Posts: 7,419 Major grins
    edited November 26, 2010
    Art,

    I think your comparing pixel dimensions with file size. Remember the jpg format compresses the image. When you open it you expand it.

    Sam
    www.samlinvillephotography.com
  • Art ScottArt Scott Registered Users Posts: 8,959 Major grins
    edited November 26, 2010
    WillCAD wrote: »
    Maybe you're just misreading it, Art. Windows might be telling 17mb, not 1.7b. 17mb is close enough to 20mb that the difference could be in how the two count; Windows may consider a mb to be 1024kb, etc, while Photoshop may be counting a mb as 1000kb like a hard drive manufacturer does.

    You'll have to take another look when you've had some shut-eye to confirm or debunk this hypothesis.

    If i had give n 17mb I would not have questioned it........

    my properties says 1.71MB.....just rechecked....I think I am losing it......what shos in the images size menu is pixel dimensions of say 20.xx M........that is not actually the file size but the total number of pixels (RGB) with the dimension of the image of 3000pixels by 2000pixels....if I understand what i read on a couple of forums I found by googling pixel dimensions........I had just compared the 2 (properties file size to pixel dimensions)
    "Genuine Fractals was, is and will always be the best solution for enlarging digital photos." ....Vincent Versace ... ... COPYRIGHT YOUR WORK ONLINE ... ... My Website

  • NikolaiNikolai Registered Users Posts: 19,035 Major grins
    edited November 26, 2010
    Art,

    PS tells you what the image BITMAP size is (as in matrix of pixels, each pixel being 8-bit, or 16-bit, or 32-bit, depending on the mode you're at).

    OS tells you what the filesize is, after all the compression (lossless or lossfull) tricks have been applied.

    HTH
    "May the f/stop be with you!"
  • colourboxcolourbox Registered Users Posts: 2,095 Major grins
    edited November 26, 2010
    Try this...take the same image, save in 3 or 4 formats (like PSD, TIFF uncompressed, TIFF ZIP or LZW compressed, JPEG 3, JPEG 10) and see how the numbers look side by side in Windows. I'm pretty sure the same (uncompressed) number will show inside Photoshop, and the file sizes in Windows will all reflect whatever compression factor they are, on disk.
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