For example, it may turn out to be as simple as: pos = pixel_array_offset + row_size * y + pixel_size * xįinally, once you've changed your red pixels to white, you can save it with: with open('eggs. Their quality and resolution mean that itâs easier to edit BMP files because. This gives BMP images a higher resolution than JPEG files. The file may also contain information like color depth, color profiles, alpha channels, and more. i know eventually no matter PNG,JPG,BMP always unfold to BitmapData, then upload to GPU, but if i need to use some asset like those, i need loop each pixel and copy the pixel to another BitmapData (detect if the piexl not the background colour). resize it, crop it or whatever you need to do to get it to 480x272 pixels then save it as a BMP picture. i use Starling( Actionscript3 ) engine, normaly i use PNG or JPG file as the texture. In a BMP image, each pixel has its own specific color. Find a pic you want and open it in paint. Now, once you've found the "pixel array" portion of the BMP, and you've figured out how to interpret it from the DIB header, you can just set pixels to white at whichever positions you want by setting the values at the appropriate indexes of the bytearray. BMP files generally have a higher quality than JPEGs. But you might want to ask your teacher for feedback on that. In fact, you can probably just assume that all of the headers will specify the most common variant and only code for that. I'm guessing you can ignore all the options for BMP compression-otherwise, this would be way too hard an assignment. and re-combining them into a 32-bit number. Image Tuner is a program for batch resizing, converting, watermarking, and renaming your digital photos/images from/to JPEG, BMP, PNG, TIFF, and GIF formats. The struct module in the standard library will be very helpful for interpreting the headers it's much easier to read a 32-bit little-endian number with struct.unpack_from('assume the main point of the exercise is figuring out how to do that yourself, so I'll give you a link to Wikipedia's article, which describes it better than the Microsoft docs, and you can go from there. Next, you need to parse the BMP file format. Since a bytes object isn't mutable, you will probably want to copy it into a bytearray to work with. And you can't read it "line by line", because it doesn't have lines of text to read. That means you have to read it in binary mode. The code is simple enough that you could figure it out in a few minutes from the examples on the Image module docsâ¦Ä«ut if you're not allowed to do that, let's look at how to do this manually.įirst, BMP isn't a text file format, it's a binary format. The easy way to do this is with a third-party image-processing library like PIL/Pillow.
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