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To reduce math precision problems Y can vary 16...235, Cb and Cr can vary 16...240. That's said in the Wikipedia article where you caught your image from.

The remaining number of available color codes is 220 x 225 x 225 = 11137500.

That's theory. JPEG compression causes errors. A mathematician is needed to check if the actually used JPEG coding and decoding implementation reduces the number of available color codes or generates some new Y, Cb or Cr values which are not inside the original range and the display system shows them as new colors. Such new colors, of course, are erratic, but they might be seen.

I'm afraid very few of us know enough of the actually used implementations. Let's hope a valid answer which covers some commonly used real systems will be written soon. While waiting one ask also people who work with image signal processing.

To reduce math precision problems Y can vary 16...235, Cb and Cr can vary 16...240. That's said in the Wikipedia article where you caught your image from.

The remaining number of available color codes is 220 x 225 x 225 = 11137500.

That's theory. JPEG compression causes errors. A mathematician is needed to check if the actually used JPEG coding and decoding implementation reduces the number of available color codes or generates some new Y, Cb or Cr values which are not inside the original range and the display system shows them as new colors. Such new colors, of course, are erratic, but they might be seen. Finally the conversion to a RGB display can make more or less available codes useless.

I'm afraid very few of us know enough of the actually used implementations. Let's hope a valid answer which covers some commonly used real systems will be written soon. While waiting one ask also people who work with image signal processing.

To reduce math precision problems Y can vary 16...235, Cb and Cr can vary 16...240. That's said in the Wikipedia article where you caught your image from.

The remaining number of available color codes is 219 x 225 x 225 = 11086875.

That's theory. JPEG compression causes errors. A mathematician is needed to check if the actually used JPEG coding and decoding implementation reduces the number of available color codes or generates some new Y, Cb or Cr values which are not inside the original range and the display system shows them as new colors. Such new colors, of course, are erratic, but they might be seen.

I'm afraid very few of us know enough of the actually used implementations. Let's hope a valid answer which covers some commonly used real systems will be written soon. While waiting one ask also people who work with image signal processing.

To reduce math precision problems Y can vary 16...235, Cb and Cr can vary 16...240. That's said in the Wikipedia article where you caught your image from.

The remaining number of available color codes is 220 x 225 x 225 = 11137500.

That's theory. JPEG compression causes errors. A mathematician is needed to check if the actually used JPEG coding and decoding implementation reduces the number of available color codes or generates some new Y, Cb or Cr values which are not inside the original range and the display system shows them as new colors. Such new colors, of course, are erratic, but they might be seen.

I'm afraid very few of us know enough of the actually used implementations. Let's hope a valid answer which covers some commonly used real systems will be written soon. While waiting one ask also people who work with image signal processing.

To reduce math precision problems Y can vary 16...235, Cb and Cr can vary 16...240. That's said in the Wikipedia article where you caught your image from.

The remaining number of available color codes is 219 x 225 x 225 = 11086875.

That's theory. JPEG compression causes errors. A mathematician is needed to check if the actually used JPEG coding and decoding implementation reduces the number of available color codes or generates some new Y, Cb or Cr values which are not inside the original range and the display system shows them as new colors.

I'm afraid very few of us know enough of the actually used implementations. Let's hope a valid answer which covers some commonly used real systems will be written soon. While waiting one ask also people who work with image signal processing.

To reduce math precision problems Y can vary 16...235, Cb and Cr can vary 16...240. That's said in the Wikipedia article where you caught your image from.

The remaining number of available color codes is 219 x 225 x 225 = 11086875.

That's theory. JPEG compression causes errors. A mathematician is needed to check if the actually used JPEG coding and decoding implementation reduces the number of available color codes or generates some new Y, Cb or Cr values which are not inside the original range and the display system shows them as new colors. Such new colors, of course, are erratic, but they might be seen.

I'm afraid very few of us know enough of the actually used implementations. Let's hope a valid answer which covers some commonly used real systems will be written soon. While waiting one ask also people who work with image signal processing.