How to color a raster black and white image with a transparent outside. Based on https://stackoverflow.com/questions/57650474/how-to-apply-svg-filters-to-create-a-colored-svg-form-of-the-whole-silhouette/57656454
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Coloring a transparent image
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <style> | |
| img.complete-red { | |
| filter: url(#colorise); | |
| } | |
| img.filled-red { | |
| filter: url(#colorise2); | |
| } | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| </style> | |
| </head> | |
| <body> | |
| <svg width="0" height="0" style="position: absolute"> | |
| <defs> | |
| <filter id="colorise"> | |
| <!-- Fill the filter area with red --> | |
| <feFlood flood-color="red" result="colour"/> | |
| <!-- Trim the red to just what's "in" (inside) the image (ie non-transparent) --> | |
| <feComposite operator="in" in="colour" in2="SourceAlpha"/> | |
| </filter> | |
| <filter id="colorise2"> | |
| <!-- Fill the filter area with red --> | |
| <feFlood flood-color="red" result="colour"/> | |
| <!-- Trim the red to just what's "in" (inside) the image (ie non-transparent) --> | |
| <feComposite operator="in" in="colour" in2="SourceGraphic"/> | |
| <!-- Multiply the trimmed red shape with the original image. Black parts stay black. White parts become red. --> | |
| <feBlend mode="multiply" in2="SourceGraphic"/> | |
| </filter> | |
| </defs> | |
| </svg> | |
| <img src="https://cdn.jsdelivr.net/gh/oakmac/chessboardjs/website/img/chesspieces/wikipedia/wK.png" class="original"/> | |
| <img src="https://cdn.jsdelivr.net/gh/oakmac/chessboardjs/website/img/chesspieces/wikipedia/wK.png" class="filled-red"/> | |
| <img src="https://cdn.jsdelivr.net/gh/oakmac/chessboardjs/website/img/chesspieces/wikipedia/wK.png" class="complete-red" width=90 height=90/> | |
| </body> |
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