Dear Michal, Hello, What changes have to do in mkjpeg for more compress ratios? It will be done simply by changing some parameters in the code or it is more complicated. Thnaks
This is done via huffman AC and DC quantization tables. You can use freely available Irfanview and Jpegsnoop to extract those tables for different quality settings per given image.
Michal
Thanks
Thanks
Hi Michal
I have used Infraview and Jpegsnoop to extract Quantization tables and have got some good results. However my image is always larger than the Infraview version. So far i have not changed the Huffman tables as i am i bit unclear on how to change them, could you help me please with this?
Steve
For Huffman tables you need to modify Header RAM hex file. See 1.10.1 Header RAM Programming in documentation.
Michal
Hi Michal
I have used Infraview and Jpegsnoop to extract Quantization tables and have got some good results. However my image is always larger than the Infraview version. So far i have not changed the Huffman tables as i am i bit unclear on how to change them, could you help me please with this?
Steve
Ok thanks Michal, i'll try that!
Ok thanks Michal, i'll try that!