Can I save an image (to jpeg format) directly from YCbCr without YCbCr->RGB->YCbCr conversions?

I have a delicate YCbCr pattern, with colors. I want to save it as losslessly as possible into a JPEG. I know I can to YCbCr2RGB conversion and then save the RGB - which will be reverted back to YCbCr on the JPEG image file. Is there a way to save the YCbCr directly without the superfluous bask and forth conversions?

Answer 1

[Walter Roberson]

You can look in the File Exchange for some of the JPEG implementations and adjust them to skip the conversion.