how to get more compression

sir i have made a compressor and decompressor.. i dont get proper output from decompressor..please tell me weather the code is correct..what thing can be improve?? what should do to improve compression ratio and improve psnr
i have attached the code for compressor and decompressor

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We do not have your image 'wilson1.bmp' to test with. What does it look like and what does the decompressed image look like?

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2021-8-20

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