The brightness this time is 185 and 170, still about 8% difference. It should be obvious which is the actual cursor and which is the screenshot of the cursor in the photo. The same as the previous image but with a mosaic filter applied.
One hardware cursor, one screenshot of the hardware cursor and a 16x16 square of each grey scale value from 0 to 0xFF in 2x2 blocks. The computer is Windows XP with an NVIDEA GeForce 8500 GT graphics card connected to a Samsung 5100 TV via an HDMI cable. What hardware is doing this and how? Is the colour information being transmitted with more than 8-bits per channel? The interior of the arrow is about 191 grey (0xBF) and the background is about 177 grey (0xB1), meaning the white of the cursor is about 8% brighter than the pure white of the background. I put a mosaic filter on the image to see the average brightness better: Then I took a photo of the cursor and it clearly shows a difference in brightness: I originally thought it was an optical illusion as taking screenshots showed that both the background and the cursor were at 0xFFFFFF. I recently noticed my cursor was whiter than the background white (pure 0xFFFFFF).
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