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  • Anja Beisel 8 posts 28 karma points
    Nov 06, 2015 @ 10:34
    Anja Beisel

    Image size is bigger when added with .GetResponsiveCropUrl(crop) instead of .GetCropUrl(crop)

    Dear Jeavon,

    admire your work. But now I am confused about the following:

    I add images in the RTE with a macro. GetResponsiveCropUrl() doesn't crop the images to the wished size. I added images additionally with GetCropUrl(). The result is:

    <img class="img-thumbnail img-responsive" data-src="/media/1154/responsiveimgs02.jpg?anchor=center&amp;mode=crop&amp;quality=90&amp;width=400&amp;heightratio=0.75&amp;format=jpg&amp;slimmage=true&amp;rnd=130912391620000000" data-slimmage="true" src="/media/1154/responsiveimgs02.jpg?anchor=center&amp;mode=crop&amp;quality=90&amp;width=1120&amp;heightratio=0.75&amp;format=jpg&amp;slimmage=true&amp;rnd=130912391620000000" data-pixel-width="1120">
    <img class="img-thumbnail img-responsive" src="/media/1154/responsiveimgs02.jpg?anchor=center&amp;mode=crop&amp;width=400&amp;height=300&amp;rnd=130912391620000000">

    Apart from the problem that the responsive image doesn't crop, what i try to achieve in the moment, i was wondering how much slimmage positively influences the image size. But when I 'saved image as' from the browser it was exactly the other way round. Image no 1 (responsive) is 60 kb and image no 2 17 kb in the example above. I checked again and again. The result is in average not as dramatic as in the example above, but the responsive image is always bigger.

    Why is this like this? Thought slimmage with ImageResizer are meant to keep the image size small?

    Thank you very much for your help.

  • Carl Jackson 139 posts 478 karma points
    Nov 06, 2015 @ 17:10
    Carl Jackson

    Could this be a Css issue?

    I think you need to add img{ width:100%;} as a CSS rule.

    The way the plugin works is to determine how big the image needs to be to fill the space it is in with an image of the correct size, not that it will always be a smaller image than original.

    If the space is bigger that the original requested size then it will request a bigger image.(upto a max size) If you try reducing the size of the browser window (to mobile size) and loading the page again, what is the image size then?

    The idea is that page speed is increased as images are loaded in a size appropriate for what the user can see.



  • Anja Beisel 8 posts 28 karma points
    Nov 06, 2015 @ 23:33
    Anja Beisel

    CSS max-width:100% is added as requested by Slimsy.

    It's 2 times the same image, 1st generated with GetCropUrl(), 2nd with GetResponsiveCropUrl(), with the same CSS applied.

    Because you asked I've have added the image once more as simple img (same CSS applied) and checked the image file size with browser window full width and browser window as small as possible.

    The result is the following:

    img file size img generated with GetCropUrl() is the smallest, whatever the browser width is, then comes the img generated with GetResponsiveCropUrl(), the biggest is the basic img.

  • Carl Jackson 139 posts 478 karma points
    Nov 09, 2015 @ 09:34
    Carl Jackson

    Hi Anja,

    I'm not sure then sorry! I haven't had any issues myself using Slimsy and images have always been sized appropriately.

    Hopefully one of the Slimsy devs will be able to help you soon!



  • James Jackson-South 489 posts 1747 karma points c-trib
    Nov 09, 2015 @ 13:05
    James Jackson-South

    Hi Anja,

    What I believe might be happening is that images are being resized in accordance with high resolution screen detection which will be doubling the output dimensions.

    This is a common trick for ensuring the image is sharp on high resolution screens as the downscaling by the browser causes increased sharpness but it comes at the cost of file size.

    Slimmage, the underlying library behind Slimsy uses a quality instruction by default for lossy image formats of 80%. For me that's far too high. I would recommend something around 60%.

    Fortunately you can alter the default values by adding the following JavaScript to the top of your page before the Slimsy scripts.

    window.slimmage = {
        tryWebP: true, // Attempt to convert to webp format for smaller files.
        jpegRetinaQuality: 60, // High definition quality
        jpegQuality: 85 // Standard quality

    You can see more options in the source code here

    The image processing itself is actually done by ImageProcessor.Web not ImageResizer so if you have the latest versions installed (v4.4.0) the output images should also be heavily optimized to reduce file size further.

    I hope this proves helpful



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