how does bmp compression work?
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When the Compression member is BI_RLE4, the bitmap is compressed by using a run-length encoding format for a 4-bit bitmap, which also uses encoded and absolute modes: In encoded mode, the first byte of the pair contains the number of pixels to be drawn using the color indexes in the second byte.
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In bitmapped graphics, the image is divided into a grid of picture elements or pixels. When an image is loaded, the binary codes that represent the colour of each pixel are transferred to memory.
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INTRODUCTION. The Differential pulse code modulation (DPCM) [1,2] may be used to remove the unused bit in the image for image compression In analog messages we can make a good guess about a sample value from knowledge of past sample values.
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You can use animated PNGs. Try Huffyuv. It is a lossless codec that might work well with the kind of video you are talking about. ... GIFs and PNGs are good for, basically, anything with flat colors (like cartoons and such).
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Each pixel typically consists of 8 bits (1 byte) for a Black and White (B&W) image or 24 bits (3 bytes) for a color image-- one byte each for Red, Green, and Blue. 8 bits represents 28 = 256 tonal levels (0-255).
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If the entire image is pure black, all you need to store to be able to reconstruct the image is: the size of the image, and the color black (once). That's a very small file. If the image has a unique color on each pixel with no pattern, you'll have to store each color, leading to a larger file size.
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BMP is both uncompressed and lossless. PNG is compressed but lossless. Thus, with a lossless format the only visible difference is the file size. I'd recommend using PNG over BMP unless you can't for compatibility reasons.
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One might think that a format with such a long legacy would be still in use for a lot of things, but the fact is that BMP is simply not suited for the internet. Of course, you can still use it to this day, but you would have to think long and hard to justify its use, and probably be unable to do so anyway.
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The BMP format is both lossless and uncompressed. Uncompressed and lossless are not the same. Some compression formats are lossy (for images, the most common one is JPEG) and others are not (the compression methods used by GIF, PNG and TIFF images, for example).
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There is no single "best" JPEG compression setting, and depending on the type and complexity of detail (or lack of complexity and detail), you may find yourself using 40-60, 70-80, or 90-100 as appropriate for the photo(s) you are exporting.
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GIF images are compressed using the Lempel–Ziv–Welch (LZW) lossless data compression technique to reduce the file size without degrading the visual quality.
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Raw files that have been converted to DNG tend to be smaller in size compared to the original raws. This is because the lossless compression method Adobe uses is generally more efficient compared to that implemented by most proprietary raw formats. In some instances the file size savings can be really dramatic.
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To add to what the others have said - file size from jpeg compression is image dependant. Some images compress really well, others result in bigger files. Use Export save for web (Legacy) and adjust the compression slider whilst looking at the image in the preview.
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It will appear as though you are zoomed in 200% because your footage is that much bigger than the "window" at which you are looking at it through. You can open up your clip's effect controls, and under motion change the size until it "fits".
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When you downscale from 4K to full HD, you're essentially oversampling the image to have 4x the data for every pixel. Therefore, when you have 4K footage and downscale it to 1080p (Full HD), the image is going to look better than it would at native 1080p. ... YouTube's 4K platform is otherwise fantastic for what it is.
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There is one of these 8-bit values each for Red, Green, and Blue. So, a 6 megapixel (MP) image would occupy 6,000,000 pixels x 3 bytes or 18,000,000 bytes uncompressed (i.e. 18 MB). Generally speaking, the more megapixels a digital image contains, the more megabytes (MB) it will consume on a hard drive or memory card.
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MPEG achieves its high compression rate by storing only the changes from one frame to another, instead of each entire frame. The video information is then encoded using a technique called Discrete Cosine Transform (DCT). MPEG uses a type of lossy compression, since some data is removed.