pngcrush

PNG optimization issue using pngcrush tool

由 别来无恙 提交于 2020-01-23 15:44:29
问题 I have few queries on "pngcrush" tool. While xcode build process, I am setting option "Compress PNG Files" to "YES" and then checked the binary and image size. Then in my another build process, I am setting option "Compress PNG Files" to "NO" and then again checked the binary and image size. But, there is no any difference between 1. and 2. in binary/image size. Why "pngcrush" tool is not optimizing the png files? Any help would be great. Thanks in advance. Regards, Devendra 回答1: Files are

PNG optimization issue using pngcrush tool

由 你。 提交于 2020-01-23 15:44:13
问题 I have few queries on "pngcrush" tool. While xcode build process, I am setting option "Compress PNG Files" to "YES" and then checked the binary and image size. Then in my another build process, I am setting option "Compress PNG Files" to "NO" and then again checked the binary and image size. But, there is no any difference between 1. and 2. in binary/image size. Why "pngcrush" tool is not optimizing the png files? Any help would be great. Thanks in advance. Regards, Devendra 回答1: Files are

Client PNG compression using javascript like pngcrush?

由 会有一股神秘感。 提交于 2020-01-14 04:38:08
问题 I'm developing HTML5 apps. When user uploads image from their mobile, the size was too large. I want to compress the image as PNG like the pngcrush way. Is there any good way to choice on the frontend (like a javascript library)? Or is it possible to port the pngcrush library to javascript? 回答1: There are a few projects out there which seem to be based around the idea of using emscripten (a LLVM-to-JavaScript compiler) to actually compile the source code from pngcrush to working JavaScript

What is PngCrush in iOS?

由 早过忘川 提交于 2019-12-17 16:27:01
问题 i know that Pngcrush is an image optimisation technique in iOS , but my doubt is does X-code will perform this internally during each build or before deploying our app to iTunes store we need to do this image optimization? 回答1: Xcode does the conversion during build. The final app will have modified pngs, you don't have to do anything manually. 回答2: The PNG crushing is done using the pngcrush tool which you can access manually with this command: xcrun -sdk iphoneos pngcrush -iphone ... Xcode

How to do PngCrush for my images of iOS app? [duplicate]

由 风格不统一 提交于 2019-12-12 05:09:38
问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: What is PngCrush in iOS? I'm having a doubts about image optimisation technique of iOS apps Pngcrush My doubt is, Is pngcrush built-in to xcode or do we need to explicitly download pngcrush tool and optimise our images? If we want to do it explicitly how can we achieve this? 回答1: This question may solve your problem: Skipping the 'CompressResources' build step for XCode iPhone apps Another thing is there might

pngcrush: uncrush on linux? [closed]

由 百般思念 提交于 2019-12-07 10:41:26
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Apple's iOS SDK use a modified version of pngcrush for converting png files in iOS bundles. Their version can also revert the changes (using the "-revert-iphone-optimizations" switch), but the original version can't. Is there a tool that can be run on Linux and revert the iphone optimizations? Thanks. 回答1:

GraphicsMagick CgBI unknown critical chunk

由 帅比萌擦擦* 提交于 2019-12-07 01:21:31
问题 I am using GraphicsMagick and currently running into the following issue: when executing gm identify <filename>.png I'm getting the following error: gm identify: CgBI: unknown critical chunk (<filename>.png) gm identify: Request did not return an image. This is a png extracted from an iPhone. Though it may not contain an actual image, I do need the image info. Tried opening it with several editors: The png does open in Paint with the right height x width but as completely white. The png does

优化包大小-PNG部分

由 浪子不回头ぞ 提交于 2019-12-06 14:56:18
背景 PNG 图片相对于 JPEG 图片来说，它是一种无损的图像存储格式，同时多了一条透明度通道，所以一般情况下，PNG 图片要比 JPEG 图片要大，并且 PNG 图片往往还是 APK 图片资源中的大头，所以优化 PNG 图片的大小，对于减小包的体积来说，是比较有回报的事情。 关于 PNG 的 wiki： 便携式网络图形 （英语： P ortable N etwork G raphics， PNG ）是一种 无损压缩 的 位图 图形格式，支持索引、 灰度 、 RGB 三种颜色方案以及 Alpha通道 等特性。 关于 JPEG 的 wiki： 联合图像专家小组 （英语： J oint P hotographic E xperts G roup，缩写： JPEG ）是一种针对照片影像而广泛使用的 有损压缩 标准方法。 常用的压缩算法 关于 PNG 的压缩算法有很多，这里我们只说两种比较常用的： Indexed_color 和 Color_quantization 。这两种也是 Google 在 Android 开发者网站上推荐的，具体可以看 network-xfer 。 下面我们会简单说下这两种算法的大概原理，更深入的知识请移步 Google 或者 Wiki。 Indexed_color 字面意思就是索引颜色，通过将具体的 ARGB 颜色存储转换成索引下表，来减少文件的大小。我们知道

优化包大小-PNG部分

由 二次信任 提交于 2019-12-06 13:38:30
背景 PNG 图片相对于 JPEG 图片来说，它是一种无损的图像存储格式，同时多了一条透明度通道，所以一般情况下，PNG 图片要比 JPEG 图片要大，并且 PNG 图片往往还是 APK 图片资源中的大头，所以优化 PNG 图片的大小，对于减小包的体积来说，是比较有回报的事情。 关于 PNG 的 wiki： 便携式网络图形 （英语： P ortable N etwork G raphics， PNG ）是一种 无损压缩 的 位图 图形格式，支持索引、 灰度 、 RGB 三种颜色方案以及 Alpha通道 等特性。 关于 JPEG 的 wiki： 联合图像专家小组 （英语： J oint P hotographic E xperts G roup，缩写： JPEG ）是一种针对照片影像而广泛使用的 有损压缩 标准方法。 常用的压缩算法 关于 PNG 的压缩算法有很多，这里我们只说两种比较常用的： Indexed_color 和 Color_quantization 。这两种也是 Google 在 Android 开发者网站上推荐的，具体可以看 network-xfer 。 下面我们会简单说下这两种算法的大概原理，更深入的知识请移步 Google 或者 Wiki。 Indexed_color 字面意思就是索引颜色，通过将具体的 ARGB 颜色存储转换成索引下表，来减少文件的大小。我们知道

What is PngCrush in iOS?

由 拟墨画扇 提交于 2019-11-27 22:34:45
i know that Pngcrush is an image optimisation technique in iOS , but my doubt is does X-code will perform this internally during each build or before deploying our app to iTunes store we need to do this image optimization? Xcode does the conversion during build. The final app will have modified pngs, you don't have to do anything manually. The PNG crushing is done using the pngcrush tool which you can access manually with this command: xcrun -sdk iphoneos pngcrush -iphone ... Xcode will do this automatically for any files added to your target with the "PNG" file type: If you include resources
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