compression

问题 I'm using opencv to crop tif files, everthing is fine, except for saving image to a file - opencv always uses LZW compression, but i don't need compression on resulting files, i do appreciate opencv's help in saving my disk drive space, but now is not the right time to do it. So is there a way to save tif files with specific compression scheme (including no compression) or no? Original images have no compression scheme applied and i'm using ROI to select area and SaveImage to save it to the

问题 I'm trying to find a balance between performance and degree of compression when gzipping a Java webapp response. In looking at the Deflater class, I can set a level and a strategy. The levels are self explanatory - BEST_SPEED to BEST_COMPRESSION . I'm not sure regarding the strategies - DEFAULT_STRATEGY , FILTERED and HUFFMAN_ONLY I can make some sense from the Javadoc but I was wondering if someone had used a specific strategy in their apps and if you saw any difference in terms of

问题 I'm trying to find a balance between performance and degree of compression when gzipping a Java webapp response. In looking at the Deflater class, I can set a level and a strategy. The levels are self explanatory - BEST_SPEED to BEST_COMPRESSION . I'm not sure regarding the strategies - DEFAULT_STRATEGY , FILTERED and HUFFMAN_ONLY I can make some sense from the Javadoc but I was wondering if someone had used a specific strategy in their apps and if you saw any difference in terms of

问题 I have large zip files that contain huge files. There are "metadata" text files within the zip archives that need to be modified. However, it is not possible to extract the entire zip and re-compress it. I need to locate the target text file inside the zip, edit it, and possibly append the change to the zip file. The file name of the text file is always the same, so it can be hard-coded. Is this possible? Is there a better way? 回答1: There are two approaches. First, if you're just trying to

问题 How do I use UPX with pyinstaller? I am following the docs. I have downloaded UPX. My file looks like: import csv import selenium import pandas print('Hello') I then run: pyinstaller -F --upx-dir C:\Users\DD\Downloads\upx394w\upx394w\123\upx308w\upx.exe zz.spec This does not affect the size of the file. Any idea how I can get this to work? # -*- mode: python -*- block_cipher = None a = Analysis(['zz.py'], pathex=['C:\\Users\\DA\\13\\14'], binaries=[], datas=[], hiddenimports=[], hookspath=[],

问题 I'm trying to read a compressed binary .x mesh file but my decompression is failing. The file is basically some directx header info and then a bunch of data in MSZIP format (i.e. 2 bytes are an int blockSize , 2 bytes are a "magic number" and then there are blockSize deflated bytes and then repeat until there's no more data) so for each block I'm just getting the compressed bytes and deflating like so- internal static byte[] DecompressBlock(byte[] data) { var result = new List<byte>(); var ms

问题 I'm trying to read a compressed binary .x mesh file but my decompression is failing. The file is basically some directx header info and then a bunch of data in MSZIP format (i.e. 2 bytes are an int blockSize , 2 bytes are a "magic number" and then there are blockSize deflated bytes and then repeat until there's no more data) so for each block I'm just getting the compressed bytes and deflating like so- internal static byte[] DecompressBlock(byte[] data) { var result = new List<byte>(); var ms

问题 I'm trying to read a compressed binary .x mesh file but my decompression is failing. The file is basically some directx header info and then a bunch of data in MSZIP format (i.e. 2 bytes are an int blockSize , 2 bytes are a "magic number" and then there are blockSize deflated bytes and then repeat until there's no more data) so for each block I'm just getting the compressed bytes and deflating like so- internal static byte[] DecompressBlock(byte[] data) { var result = new List<byte>(); var ms

问题 As part of our installer build, we have to zip thousands of large data files into about ten or twenty 'packages' with a few hundred (or even thousands of) files in each which are all dependent on being kept with the other files in the package. (They are versioned together if you will.) Then during the actual install, the user selects which packages they want included on their system. This also lets them download updates to the packages from our site as one large, versioned file rather than

问题 Is there any way to compress large files into smaller .zip of .tar.gz files in google drive? I tried google appscript but it created .zip files but not compressing. How to do this? 回答1: I have tried and tested the below code with a pdf file which is in my Drive of 10MB size and it did compressed it for 9MB. I even tested for a Drive file(slides), it did compress it. function fileZip(){ var files = DriveApp.getFilesByName('Google_Apps_Script_Second_Edition.pdf'); while (files.hasNext()) { var