Load the image into a pixel-accessible format
Convert the image to an array or buffer
Loop through each pixel or target pixel
Read the current pixel values
Modify the RGB or RGBA values as needed
Write the new pixel values back to the image
Save or display the updated image
Use image libraries such as PIL, OpenCV, or NumPy in Python
Use direct pixel access methods such as `getpixel` and `putpixel` in PIL
Use array indexing for bulk pixel changes
Apply masking for selective pixel edits
Preserve the alpha channel if transparency must remain unchanged