Legacy ImageMagick Discussions Archive

Can you please tell me how can I convert a ppm image to a YUV NV12 format?

Let's say I have a ppm image with size 800X600, called sage_1.ppm, what to do to convert it to a yuv nv12 format?

Thanks. But I get an 'unexpected end of file error: The original image Bretagne1.ppm from http://www.openjpeg.org/index.php?menu=samples. is 640X480. $ mv Bretagne2.Cb temp.gray $ convert -size 640x480 -resize 50% temp.gray ~/Downloads/Bretagne2-ds.Cb convert: unexpected end-of-file `temp.gray ...

Thanks Glen for your reply. I tried that with my sample image Bretagne1 from http://www.openjpeg.org/index.php?menu=samples. It has even row and column. But I get this error: $ convert ~/Downloads/Bretagne1.ppm -interlace partition -colorspace YCbCr Bretagne2.ycbcr $ convert -resize 50% ~/Downloads ...

Thanks but it does not give me what I am looking for. I am looking for what this does, but break it down in YCbCr instead of YUV: convert ~/Downloads/Bretagne1.ppm -interlace partition Bretagne2.yuv This is the output from the above comment. Each Y, U, V is smaller than the original image (921638 ...

Thanks a lot for your answer. I get "save Y to a file, U to a file , V to a file" works. But how can I save Y to a file , Cb to a file, Cr to a file? I tried: convert ~/Downloads/Bretagne1.ppm -interlace partition -colorspace YCbCr Bretagne2.yuv does not work. And I tried: convert ~/Downloads ...

Thanks a lot for all your answers!

Thanks for the pointers. I googled how to use 'interlace'. From this http://www.chemie.fu-berlin.de/chemnet/use/suppl/imagemagick/www/convert.html, it seems like it will create a interlaced GIF or progressive JPEG. How can I save Y to a file, U to a file , V to a file? Sorry that my question are ...

Thanks for all the answers. If I understanding correctly, PPM image can't be in YUV 422 format, it can only in RGB format. My next question is , can I use IM to convert PPM's RBG format to YUV422 and save Y , U, V's data into different files? i.e. the output image is not an image but 3 planes of Y ...

Hi, I am trying to use imageMagick to convert a ppm image in RGB format to YUV422 format: I am using Bretagne1 ppm from: http://www.openjpeg.org/index.php?menu=samples I tried: convert ~/Downloads/Bretagne1.ppm -colorspace YCbCr ~/Downloads/Bretagne2.ppm convert ~/Downloads/Bretagne1.ppm -colorspace ...

Thanks. I get the image "tulips_yuv422_inter_planar_qcif.yuv " from http://www.sunrayimage.com/examples.html. I find out the image is All in qcif format, 176x144. so I tried using IM by "display -size 176x144 -colorspace YUV tulips_yuv422_inter_planar_qcif.yuv " It seems to me the 'red' part of the ...

Hi, I am running ImageMagick on ubuntu. How can I use it to optn a yuv image? I tried: display ~/Downloads/tulips_yuv422_inter_planar_qcif.yuv display: must specify image size `~/Downloads/tulips_yuv422_inter_planar_qcif.yuv' @ error/yuv.c/ReadYUVImage/145. How can I find out the size of a yuv image ...