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rubyimagemagickminimagick

Manipulate pixels using Minimagick

Is there a way to manipulate pixels and create or modify the manipulated image to reflect the changes made to the pixels ?

Minimagick only provides a get_pixels method.

Should I convert the array to a string and use the import_pixels method ? but then, how can I reconvert the pixels to a blob ?

Solution

  • Correct, you should use the import_pixels method. Here's a full example:

    # get pixels
img = MiniMagick::Image.open("image.jpg")
pixels = img.get_pixels

# transform pixels
reverse = pixels.map(&:reverse)

# save pixels
blob = reverse.flatten.pack("C*")
img = MiniMagick::Image.import_pixels(blob, img.width, img.height, 8, "rgb", "jpg")
img.write("reverse.jpg")