Converting 4 hex bytes to RGBA color

I have an 512x512 image file that uses every 4 bytes for a RGBA pixel. Here's an example:

1F 8B 08 00

The first (R), second (G), and third (B) bytes represent the RGB values, with each value ranging from 0 to 255. The last byte (A) represents the alpha channel, also ranging from 0 to 255. If I want a opaque pixel I must replace the last byte with FF (255 when converted to decimal). Once I converted the 4 bytes into RGBA I can use PIL to create the image, with the first 4 bytes being a pixel located in the upper left corner.

Now here is the 4 bytes, converted into a 1x1 RGBA pixel manually: image

And here's the pixel's RGBA values, based on the 4 bytes:

199(R) 239(G) 125(B) 213(A)

Basically, each byte should be converted into a number ranging from 0 to 255, with each 4 bytes being an RGBA value. I can put these values into a tuple, iterating every 4 values as an RGBA pixel, with the first pixel being on the upper left corner of the image.

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