Image library and breakpoints

  • Paul Skip Brown

    (@paul-skip-brown)


    11 years, 3 months ago

    Hi, I’ve read the readme files and had a look around but I’m still a little confused. Numerous images sizes are created when an image is uploaded as defined in my functions.php. It may be that appropriate images are not created for the appropriate break points in my theme – my theme is responsive but I think image sizes were defined for different purposes rather than adaptive functionality.

    If I try to run this do I need to ‘regenerate thumbnails’ to create sizes that may be missing for the ideal srcset code (not an issue) and how do I define my breakpoints for each image (or don’t I need to).

    Aoologies if this is covered – I may have missed it.

    https://ww.wp.xz.cn/plugins/ricg-responsive-images/

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  • Plugin Contributor Joe McGill

    (@joemcgill)

    11 years, 3 months ago

    Hi Paul,

    No apologies needed. When I hear people asking about responsive images they are usually using the same term to describe two different types of behavior – a) changing resolutions of an image to fit a browsers size and pixel density and b) serving different crops (aspect ratio switching) of the same image at different breakpoints, i.e., the art direction use case.

    This plugin only covers the first case, and does so by taking advantage of the new srcset attribute using w descriptors to let the browser know all of the available images from which it could choose depending on its size and density. In our next release, we will be adding the sizes attribute to tell browsers how wide the image will be at each breakpoint.

    I hope that helps.

    – Joe

    Thread Starter Paul Skip Brown

    (@paul-skip-brown)

    11 years, 3 months ago

    Thank you Joe, understood, so I think if I have 1:1 ratio images in a couple of sizes it would probably make sense to ‘regenerate thumbnails’ to make more options available to the browser. If it only had one option (okay unrealistic) then responsiveness wouldn’t be an option anyway. Is that about right? I guess the trick is deciding what sizes I need to generate.

    Plugin Contributor Joe McGill

    (@joemcgill)

    11 years, 3 months ago

    That’s correct. For any image using an exact (i.e., hard cropped) ratio, you’ll need to add additional image sizes for every option you want to use. For example, if you have 150px square thumbnails and want to include a 2x version, you would also need to add a 300px square option. Regenerating thumbnails would then create the 300px size for all the images you have already uploaded (as long as the original is large enough).

Viewing 3 replies - 1 through 3 (of 3 total)

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