Have one great god know JPG format compression, want to take a picture compression to the original size of 50 percentage, currently use sevenzip compression pressure only around ten percent, the c #! Images were processed, so the only pressure ten percent!

CodePudding user response:

Well, seems to be sister, then we use the analogy to lose weight

Average person can lose weight first month usually minus 20-10 jins, 2 months can subtract 5 jins is good, can reduce 2 jins of 3 months even if victory

Only so much water, squeeze out

CodePudding user response:

Although it is said that but this is the functional requirement, have to make

CodePudding user response:

If you use other compression tools I have less than 50% that is also not possible in c #

Only to find her to let them reduce the resolution or color depth

CodePudding user response:

If has been compressed JPG format, it basically no compression space, do not believe you will be the picture with a zip compression software can see how much small

CodePudding user response:

Compression algorithms are roughly similar, actually it is hard to have a compression algorithm is twice as tall as other pixels can try to change it

CodePudding user response:

Bai ~ distortion compression

CodePudding user response:

refer to 6th floor assky124 response:

distortion compression bai ~

The text is above, have to see clearly,

CodePudding user response:

Words it doesn't matter ah, can be turned into black and white

CodePudding user response:

Fidelity and it is difficult to small,

7 zip this kind of compression algorithm, for gm, so can only use keyframes to predict + + first-order difference compression successive 0 or 1, continuous Spaces, carriage returns,

So the data itself is rarely appears successive 0 or 1, or do not have what key frames, so he is difficult to compress,

Special image comparison, can be used in a lossy compression, are largely + frequency domain filtering, plus one order difference

Basic can choose "turn lattice vector" + then compression, vector drawing does not save the bitmap, only the compressed data is relatively easy

CodePudding user response:

references 9 f wanghui0380 response:

both to fidelity, and it is difficult to small,

7 zip this kind of compression algorithm, for gm, so can only use keyframes to predict + + first-order difference compression successive 0 or 1, continuous Spaces, carriage returns,

So the data itself is rarely appears successive 0 or 1, or do not have what key frames, so he is difficult to compress,

Special image comparison, can be used in a lossy compression, are largely + frequency domain filtering, plus one order difference

Basic can choose "turn lattice vector" + then compression, vector drawing does not save the bitmap, only the compressed data is relatively easy

Recently I saw a bunch of base64 code on the Internet, I put him into the picture, and then themselves into base64 code, but I turned the base64 than the original, is too much long, is there more than one way to turn the base64

CodePudding user response:

references to the tenth floor demon elder sister's reply:

Quote: references 9 f wanghui0380 response:

both to fidelity, and it is difficult to small,

7 zip this kind of compression algorithm, for gm, so can only use keyframes to predict + + first-order difference compression successive 0 or 1, continuous Spaces, carriage returns,

So the data itself is rarely appears successive 0 or 1, or do not have what key frames, so he is difficult to compress,

Special image comparison, can be used in a lossy compression, are largely + frequency domain filtering, plus one order difference

Basic can choose "turn lattice vector" + then compression, vector drawing does not save the bitmap, only the compressed data is relatively easy

Recently I saw a bunch of base64 code on the Internet, I put him into the picture, and then themselves into base64 code, but I turned the base64 than the original, is too much long, is there more than one way to turn the base64.

Base64 just a coding way, the source data is long after the big code, only and your choice of coding,

CodePudding user response:

refer to 7th floor demon elder sister reply:

Quote: refer to the sixth floor assky124 response:

distortion compression bai ~

The text is above, to see clearly,

Stick a picture as you,

JPG is lossy compression, has been to maximize the compressed data,

Want files smaller, or lower resolution, or reduce the image quality,

Feel your computer basic principle, to master the very few, training graduation? It is best to reinforcement,

CodePudding user response:

JPG compression algorithm is adjustable, you can set the compression quality and compression rate, both is inversely proportional to, requiring necessarily low quality high compression rate, high compression rate quality will return is low, the trade-off between, you can find some online look at open source JPEG code,