We have the option to Scale the images by floating point number (sc=.25 = 25%) in Sitecore XP media library.
Now we have integrated the Sitecore DAM images and want to apply scaling by floating point number.
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You can use Transformations to configure your preset renditions and then apply them dynamically to provide users with renditions in different dimensions without the need to regenerate the public link.
So, you can create a new Transformation for your cropping and resizing purpose in the Manage -> Transformations section, say call it "25Resizing" and set all the settings in: Name, Crop, Width, Height and Quality.
Then in order to apply a transformation to an asset you simply need to append the transformation name to the URL of the public link as a query parameter named
t. For example, in our case a transformation is called "25Resizing" and the value
&t=25Resizing should be applied to the public link URL.
More information about Transformations can be found here.