What did you do?

I tried to create an image with HSV mode and set its color to blue with following kwargs

• color=(170, 255, 255) # 170 == 255 * (2/3)
• color="hsv(240, 100%, 100%)"

What did you expect to happen?

To get a blue image with both approaches.

What actually happened?

The color="hsv(240, 100%, 100%)" kwarg created a white image.

What are your OS, Python and Pillow versions?

• OS: Arch Linux
• Python: Python 3.10.11
• Pillow: 9.4.0

Image.new("HSV", (200, 200), (170, 255, 255)).show()

Image.new("HSV", (200, 200), color="hsv(240, 100%, 100%)").show()

I tried converting to RGB first, but that has the same result.

# blue
Image.new("HSV", (200, 200), color=(170, 255, 255)).convert("RGB").save("image.png")

# white
Image.new("HSV", (200, 200), color="hsv(240, 100%, 100%)").convert("RGB").save("image.png")

Something weird is also happening with getpixel() method.

When a tuple is used to set a color it works. The image is still in HSV mode, so 170 is 240 hue, and 255 is 100% saturation and value.
The pixel bytes have expected values.

Image.new("HSV", (200, 200), (170, 255, 255)).getpixel((0,0))
Out[173]: (170, 255, 255)

However, when a string is used, then the pixel bytes are totally off. It looks like it is returning RGB mode, since this is blue color in RGB code.

Image.new("HSV", (200, 200), color="hsv(240, 100%, 100%)").getpixel((0,0))
Out[174]: (0, 0, 255)

So I tried using RGB mode for the image and that works as expected.

Image.new("RGB", (200, 200), (0, 0, 255)).getpixel((0,0))
Out[177]: (0, 0, 255)

Image.new("RGB", (200, 200), color="hsv(240, 100%, 100%)").getpixel((0,0))
Out[178]: (0, 0, 255)