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yes, opencv has javascript bindings !

I would like rgba(0, 0, 255, 255) in return

some quite unusual format, and not supported from opencv (if you meant that literally).

but you can use cvtColor():

• to convert to to grayscale
• or to convert it to either LAB,YUV or YCbCr, and split() off the luminance channel (L or Y)

both approaches will result in a single channel, uchar image.

(alpha, being irrelevant in comuter-vision, will just get discarded)

yes, opencv has javascript bindings !

I would like rgba(0, 0, 255, 255) in return

some quite unusual format, and not supported from opencv (if you meant that literally).

but you can use cvtColor():

• to convert to to grayscale
• or to convert it to either LAB,YUV or YCbCr, and split() off the luminance channel (L or Y)

both approaches will result in a single channel, uchar image.

(alpha, being irrelevant in comuter-vision, computer-vision, will just get discarded)