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Thread: Skipping already compressed JPG files on batch processing

  1. #1

    Default Skipping already compressed JPG files on batch processing

    Hello, I use IrfanView batch processing feature and it works great. Though, sometimes I forget which images I compressed. Is there a way to detect if the image to be processed has a compression quality at 80 (which I use) or less, and skip those images?

    Thanks for the great program.
    Last edited by tinera; 31.07.2019 at 09:48 AM.

  2. #2
    Moderator Enterprise User Bhikkhu Pesala's Avatar
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    No.

    The JPG Save option "Try to save with original JPG quality (estimation)" will be the best option to use because images compressed with a lower value than 80 will be saved with minimal corruption, but those image that are direct from a camera will have an estimated save quality of 95 or more.

    You can easily identify the original camera images if you sort by file size, but that's only useful if the images are all the same pixel dimensions.

  3. #3

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    Quote Originally Posted by Bhikkhu Pesala View Post
    No.

    The JPG Save option "Try to save with original JPG quality (estimation)" will be the best option to use because images compressed with a lower value than 80 will be saved with minimal corruption, but those image that are direct from a camera will have an estimated save quality of 95 or more.

    You can easily identify the original camera images if you sort by file size, but that's only useful if the images are all the same pixel dimensions.
    Thanks for the information, Bhikkhu Pesala. Sadly, the images are not all from cameras. My issue is that I have been accumulating images over the years. Sometimes I use the batch processing feature to lower their sizes. Though, right now I do not know which ones I compressed (my fault). I have noticed (after testing) that the compression / quality value can be easily acquired from images. I have used the online tool here:

    https://www.imgonline.com.ua/eng/det...eg-quality.php

    It works perfectly. So, I am thinking IrfanView can do the same and provide a means for skipping if the value is <= given value. If this is doable on IrfanView, I guess I can request it as a feature right.

    Regards.

  4. #4
    Moderator Enterprise User Bhikkhu Pesala's Avatar
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    Better start a new thread in the Feature Request section.

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