> when i want to view the results images by Irfanview software, the software 
> detect them as .jpg and says the extension .yuv is wrong.

IrfanView does not know yuv extension. You should open file "As Raw"
manually, or change the extension.

> How can i view any raw image in yuv format or even just intensity image with 
> extension(.y)?

When you choose "Open as Raw" menu, you get a dialog to specify the
image width & height, and also format. If you choose 8-bit grayscale,
you will see intensity only, even if the input is yuv (-f yuvj420).
Or, you may choose 24-bit YUV420 to see your image in color.

Sincerely,
Alex

PS Note that this list requires no to top-post.
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