What's the Difference Between HD-Photo and JPEG-XR?

[Zero]

What's the Difference Between HD-Photo and JPEG-XR? JPEG-XR is the same as HD-Photo, isn't it? But XnView treat them as different format. Why?
I convert a png file to JPEG-XR format using XnView, and Windows Vista does not know .jxr extension. I rename the .jxr extension to .wdp, and Windows Vista can open the image file but seems can not present the image file's thumbnail. And I found the JPEG-XR image which XnView converted to has the frame compare to the original png image.
What's the Difference Between HD-Photo and JPEG-XR? And what should I choose between them?
Sorry for my poor English.

[xnview]

HD-Photo & JPEG-XR are same format, but JPEG-XR use last specification (before validation)

[Zero]

HD-Photo & JPEG-XR are same format, but JPEG-XR use last specification (before validation)

Thanks for your reply. So, at this point, I'd better to choose JPEG-XR format, right?

[xnview]

HD-Photo & JPEG-XR are same format, but JPEG-XR use last specification (before validation)

Thanks for your reply. So, at this point, I'd better to choose JPEG-XR format, right?

I think, but i don't know why it's not yet supported in 7

[Zero]

The "internal color format" and "Overlapped block filtering" Write options of JPEG-XR are confusing me. Could you explain what these two options are means? And what I should set to?

[Drahken]

Vista is probably having issues due to the fact that it came out years before the format was finalized (plus the simple fact that it's vista, which means it's buggy as hell by nature).

The internal color format is the same as subsampling in other formats (look at the jpeg options in the export dialog for example). The 444 setting is the best quality, 420 is the best filesize. Lower quality subsampling throws away some of the color information, this is what leads to all the wierd artifacts you see when you look at a jpeg that has sharp edges (ie, ghosting), it is also why red looks so muddy in most jpegs.


I really don't know what the block filtering does, I'm particularly confused by the "HP only" option, wtf is "HP" in this context?

edit: I did some experiments, and the deblocking seems to trim filesize by making edges more blurred. "Off" is the best quality of the 3.

[Zero]

Vista is probably having issues due to the fact that it came out years before the format was finalized (plus the simple fact that it's vista, which means it's buggy as hell by nature).

The internal color format is the same as subsampling in other formats (look at the jpeg options in the export dialog for example). The 444 setting is the best quality, 420 is the best filesize. Lower quality subsampling throws away some of the color information, this is what leads to all the wierd artifacts you see when you look at a jpeg that has sharp edges (ie, ghosting), it is also why red looks so muddy in most jpegs.


I really don't know what the block filtering does, I'm particularly confused by the "HP only" option, wtf is "HP" in this context?

edit: I did some experiments, and the deblocking seems to trim filesize by making edges more blurred. "Off" is the best quality of the 3.

Thank you so much!