ACDSee Pro

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File name sizes after processing

(4 posts)

  • RobotDude
    Member

    Can someone explain why after processing an image its file size can change significantly. For example, I have just used ACDSee Pro to Batch Process 1800+ images carrying out Rotation, Exposure, Noise removal and Sharpening, and find that the file size on avarage has increased by 96% for images from a Canon Ixus 40 and by 63% for images from a Canon 350D.

    Posted On February 1, 2008 - 02:45 AM (1 year ago) (Permalink to this post)

  • John Radcliffe
    Member

    Two factors may be involved, both concerning JPEG compression.

    (1) ADCSee is using less compression (a higher "quality" setting) than the cameras did. This can be adjusted under "Settings" when choosing JEPG as the output file format (similarly under "Options" in the Save As dialog when using the editor). As with the camera setting, it's a question of balancing quality (fewer compression artefacts) against increased file size. [Personally, I'd suggest that you shouldn't just assume you *need* the highest quality setting available, but would recommend trying different settings and comparing the results side by side on screen, or even in print.]

    (2) After editing the resulting image may be "harder" to compress efficiently than the original. (This would probably be the case with sharpening, for example, although the opposite might be expected for noise reduction.)

    Posted On February 1, 2008 - 08:28 AM (1 year ago) (Permalink to this post)

  • RobotDude
    Member

    Thanks for your quick response.
    I would be obviously concerned should the file size be reduced but was puzzled as to why it should be increased and by such a large amount. Your explanation answers that question.
    I was processing the images to upload in order to produce a photobook and now find that they are larger rather than smaller in size! Is there a recommended JPG compression I should apply to reduce the file size of the images?

    Posted On February 1, 2008 - 09:08 AM (1 year ago) (Permalink to this post)

  • John Radcliffe
    Member

    I believe some programs let you specify a file size and the program will adjust the compression to suit, but ACDSee isn't one of those, so I think it's just down to trial and error.

    Pick what you consider a "typical" image and process it in the same way as before, but with different quality / compression settings. ACDSee uses a "percentage" setting (programs differ), but that's just an arbitrary value and gives little clue as to the actual file size you will get, which will vary from image to image anyway, as some types of subject compress more easily than others. If you want to reduce the file size by half, I'd try reducing the ADCSee setting to 3/4 of its current value, see what that gives you, and then adjust it from there.

    Posted On February 1, 2008 - 11:58 AM (1 year ago) (Permalink to this post)

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