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pverban
Participant
August 24, 2018
Answered

Resizing

  • August 24, 2018
  • 5 replies
  • 423 views

I have a picture it is say 1000 by 600.  its at 72 dpi i change it to 240 dpi and change the pixel size to reduce the size. I have it on re-sample. I need it at 300 kb or a little smaller. I do the work, save and it when it tells me the picture 300 kb or a little less.  When I look in properties the picture is only 120 kb. I needed 300 kb. I went and did them all over but I am guessing now want a more reliable way to do it or an action??? Thank you

    This topic has been closed for replies.
    Correct answer Akash Sharma

    Hi pverban,

    File size depends on the pixel dimensions of an image and the number of layers it contains. Images with more pixels may produce more detail when printed, but they require more disk space to store and may be slower to edit and print.

    I'd recommend that you save the files from the File>>Save for web menu,  In the Save for Web window, at the very top right corner you'll find a small menu icon. Click it, select "Optimize to File Size". See Optimizing images for the JPEG format for more info on this. Another helpful article you may check out: Resize a JPEG to a specific file size in Photoshop? - Graphic Design Stack Exchange

    Thanks,

    Akash

    5 replies

    Per Berntsen
    Community Expert
    Per BerntsenCommunity Expert
    Community Expert
    August 24, 2018
    it tells me the picture 300 kb or a little less.  When I look in properties the picture is only 120 kb.

    If you by "properties" mean Mac Finder or Windows Explorer, it will show you the compressed file size. (size on disk)

    The Image size dialog in Photoshop always shows you the uncompressed file size.

    Martin_Bns
    Martin_Bns
    Inspiring
    August 24, 2018

    Hi there,

    first of all, you are not setting DPI but PPI...just for sake of the clarity.
    Told that, use the Save for web option from the File menu and you can adjust your file size to what you need.

    Cheers buddy,
    Martin

    JJMack
    Community Expert
    JJMackCommunity Expert
    Community Expert
    August 24, 2018

    An Image DPI resolution settings is the image's Print Pixel size.  You can change the Print Pixel size to any size you want without changes a single Pixel use image size with resample NOT checked.  The Files size will remain the same only the Print size will change for the print pixel size has changed. An image that is 1000 pixels wide by 600 pixels high printed with pixels that are 1/72"x1/72" will print 13.9" x 8.3" the same 1000px by 600 px image printed with 1/300"x1/300" pixels will print 3.3" x 2".......

    How well a 1000px x 600px image will compressed depends on the image content. If the image is of a white wall a quality 10 jpeg will be around 26KB.   If the image is very detailed or full of noise the 1000px by 600 px image saved as a quality 10 jpeg will be around 1.5MB. A average sharp image  1000px by 600px save as a quality 10 jpeg will save around 200KB.

    Displays do not use an image DPI resolution setting.  They can not change their pixel size. Display just display your image pixels using the pixel size they were manufactured with DPI resolution is meaningless on the web Web devices displays do not use  any dpi resolution setting, What is important on the web is how many pixels you have for your images.

    Image File size is bulk is Pixel data.  More pixels larger files

    JJMack
    Mike_Gondek10189183
    Community Expert
    Mike_Gondek10189183Community Expert
    Community Expert
    August 24, 2018

    Where are you getting your file size from?

    What file format are you saving as?

    Image size file size does not take into consideration the block size your hard drive is formatted as. or whether the file format uses compression.

    Akash Sharma
    Akash SharmaCorrect answer
    Legend
    August 24, 2018

    Hi pverban,

    File size depends on the pixel dimensions of an image and the number of layers it contains. Images with more pixels may produce more detail when printed, but they require more disk space to store and may be slower to edit and print.

    I'd recommend that you save the files from the File>>Save for web menu,  In the Save for Web window, at the very top right corner you'll find a small menu icon. Click it, select "Optimize to File Size". See Optimizing images for the JPEG format for more info on this. Another helpful article you may check out: Resize a JPEG to a specific file size in Photoshop? - Graphic Design Stack Exchange

    Thanks,

    Akash

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