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Image re-sizing using TM4C123GH6PM microcontroller in Keil IDE

Hello Everybody,

I am Sreenivasa S, working as SE in XXX company, I am using the TIva C series MCU(TM4C123GH6PM)  for reducing the size of the image.

our need:

API which reduces the image size depending on the input parameter. EX: if we have 1MB image file as input then output should be of either 500KB image(50% of original image) or 250KB(25% of original image)  depending upon the input parameters to the API.

I searched for API, but I could not get any source code for our requirement, If any one has an idea or the open source please share with me. I will be much thankful. Even though exact source code not available please help me some algorithms which I can use...

Thanks in advance...

Sreenivasa.