How to extract an array of pixels from an image?

Question

Java

Hello. There is a task of this kind: there is a jpeg-image.
It is necessary to extract an array of pixels from it in order to perform operations with them such as converting from the RGB color space to YCbCr, applying a DSP transform (discrete cosine transform), quantization and LZW to them.
How can I extract a given array of pixels from a jpeg image or what language tools of the java language can I do this? For simplicity, consider a bmp image.

Answer 1

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