By default Hekate looks for /bootlogo.bmp, however some repacks overwrite this path, in which case you have to check your /bootloader/hekate_ipl.ini for specific location. For example, Kosmos overwrites the path to /bootloader/bootlogo.bmp.
What's this?
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Magical tool to convert any image (PNG, JPG, bad BMP) to Hekate's expected bootlogo.bmp format. Just feed your file, cross your fingers, and hit run.
But how?
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With magical JIMP (which stands for JavaScript Image Manipulation Program) library, all of the conversion happens on client-side.
Are the files stored somewhere?
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No, since all of the conversion is performed client-side, there is no need for a server. The only exception to this is direct URLs, due to nature of browsers, they have to be proxied through a 3rd-party service (which doesn't store anything either, it's just a universal proxy).