Results 1 to 6 of 6

Thread: 'Adjust size' option showing reduced 'resulting size' but not working

  1. #1


    Member Since
    May 30, 2018
    Posts
    3
    'Adjust size' option showing reduced 'resulting size' but not working
    Hi,

    I am using a MacBook Air, High Sierra, Version 10.13.4. (I am fairly new to MACs)

    I want to resize a jpg photo image for web use. It is currently 855 KB. If I open it in 'Preview' and select 'Adjust Size' from the Tools menu a dialog box pops up. It lists the dimensions of my image (914 x 609) and the resolution as 72 but underneath it says 'Resulting Size' - 100 percent, 194 KB (was 855 KB).

    If I click 'OK' it marks the image as 'edited' even though I haven't done anything. If I save the image I see the KB size hasn't changed (still 855). I think 194 KB is probably about right for this image. What am I missing?

    Thanks and sorry for the newbie question.
    Gavin

  2. #2

    IWT's Avatar
    Member Since
    Jan 23, 2009
    Location
    Born in Scotland, Worked in Scotland then England, Now live in Wales
    Posts
    4,264
    A warm welcome to Mac-Forums, Gavin.

    You're not doing anything wrong as much as not doing anything at all

    Open your photo in Preview as before and click on Adjust Size.

    Here is what I get with a photo:

    S1.png

    You can see that it is a big file. Note the width is 4032. By experimenting with substituting different numbers in this box, I can get the image down close to 195KB:

    S2.png

    Now hit OK.

    See if that does what you want and post back, please.

    Ian
    Ian

  3. #3


    Member Since
    May 30, 2018
    Posts
    3
    Hi Ian,

    Many thanks for getting back to me. The original file was actually 1.4 MB. I got it down to 855 KB by doing exactly what you just tried. Now I have it at the right pixel width and height for the website. However, it is still too large. I read that 72 DPI was the right level for web so don't want to go lower there but maybe that's my only option.

    Notice how in your first screen shot, it randomly says '3.4 MB (was 9MB)'. This is the bit I don't understand.

    Gavin

  4. #4

    IWT's Avatar
    Member Since
    Jan 23, 2009
    Location
    Born in Scotland, Worked in Scotland then England, Now live in Wales
    Posts
    4,264
    Notice how in your first screen shot, it randomly says '3.4 MB (was 9MB)'. This is the bit I don't understand.
    The "was xMB" refers to the original photo wherever it came from. In my case, and for the demonstration, I copied a photo from the Photos app to the Desktop, where I opened it with preview. In the copying process, there was some compression.

    Basically, you can ignore that figure and concentrate on the current figure (3.4MB in my case).

    As regards file size: you can reduce the pixel width further; or the DPI.

    Obviously, I don't know where your picture originated, but if it came from an app such as iPhoto, or Photos which has replaced it, you can compress the picture if you copy it to the Desktop first.

    Choose File > Export and then you get the chance to change a number of parameters, as in this screenshot:

    Screen Shot 2018-05-30 at 14.13.38.png

    Try experimenting with Quality and Size.

    Hope some of this makes sense

    Ian
    Ian

  5. #5


    Member Since
    May 30, 2018
    Posts
    3
    Hi Ian,

    Thanks, my dialog box looks a little different to your but I do get a 'quality' slider, which seems to have done the trick. Thanks for your help.

    Gavin

  6. #6

    IWT's Avatar
    Member Since
    Jan 23, 2009
    Location
    Born in Scotland, Worked in Scotland then England, Now live in Wales
    Posts
    4,264
    You're very welcome.

    I'm still on Sierra and you have High Sierra which probably explains the difference.

    Ian
    Ian

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. why my mp4 videos are dramatically reduced in size when transferred to my USB HD?
    By Applet in forum Images, Graphic Design, and Digital Photography
    Replies: 4
    Last Post: 01-25-2016, 12:50 PM
  2. Adjust size iPad like preview?
    By Thatguy16 in forum Images, Graphic Design, and Digital Photography
    Replies: 1
    Last Post: 08-27-2015, 09:39 PM
  3. Accessibility Text Size Option ?
    By aria in forum macOS - Operating System
    Replies: 1
    Last Post: 02-03-2010, 03:53 PM
  4. Can I adjust the default size of the HD window in column view
    By rnpowell in forum macOS - Operating System
    Replies: 1
    Last Post: 04-05-2009, 12:52 PM
  5. Easy way to adjust font size on Firefox and Camino
    By Mactheknife in forum Switcher Hangout
    Replies: 0
    Last Post: 12-15-2005, 02:58 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •