Looking to adjust the HSL of individual colors on a JavaScript canvas, similar to editing in Photoshop?

I'm looking to manipulate the HSL of an image using Javascript. I don't want to apply changes to the entire image at once, but rather target specific color sets like blues and yellows, similar to how it's done in Photoshop.

  • What type of data structure should I use for this task?
  • Are there specific formulas available for mapping these colors?
  • Is there a library that could assist me with this process?

Thank you!

https://i.stack.imgur.com/bYOUK.png

javascriptimage-processingcanvas

Answer №1

To achieve this effect, you can utilize a combination of blending mode and pixel iteration:

  • Firstly, extract the bitmap and iterate through each pixel.
  • Next, for every pixel, check if it falls within a specific range (e.g., "blues") on the HSL color wheel. Additionally, incorporate variable width to account for varying intensities towards the edges. Eliminate any pixels that do not meet the criteria.
  • Subsequently, place the modified bitmap onto a fresh canvas.
  • Set the fill style to the desired destination HSL value (you can directly specify HSL with fill-style, like "
    ctx.fillStyle = "hsl(180,100%,50%)"
    ") and fill the entire canvas using compositing mode "destination-over" to alter the overall color.
  • Adjust the blending mode on the main canvas to "color" and overlay the extracted pixel canvas on top.

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