PNG is the image format that we often use, but do you really know about PNG?This is a front-end sharing will, a bit of cold will take you to understand the PNG you do not know. There are three first questions:What is PNG?What are the features of PNG?
In general, there are two distinct types of image formats: lossy compression and lossless compression.
1. lossy compressionlossy compression reduces the amount of space the image occupies in memory and disk, and when viewed on the screen, it does
SED: Streaming editor that introduces the output of the previous program to the input of SED and converts it to another format output after a series of editing commandsBasic format of the command:SED option ' script ' file1 file2 ...Sed option-f
Tcp_wrapper as a encapsulation mechanism of the TCP protocol, which is mainly applicable to allow or deny a certain IP address to native access, previously talked about the user control of the firewall application tool iptables can also achieve this
1.gif(1) Only one image is allowed to appear in up to 256 colors(2) Support one-bit transparency, a pixel is either completely transparent, completely opaqueTransparency is 1Transparency is 0(3) Support for simple frame-based animations and
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1. Vector and bitmapVector graph-perfect ryA vector chart is used to display a
Let's take a look at the more formal explanations of several formats (note: The following are from Baidu know):
GIF is Graphics Interchange Format (Graphics Interchange Format), GIF image extension is gif. Now all graphics browsers support GIF
In the Linux system, there are three commonly used tools for processing text, and grep is one of the Three Musketeers, commonly known as text processing.grep is a powerful text search tool whose full name is: Globally search a Regular Expression and
node to fully parse the form of the picture upload, multiparty resolution and content type of HTTP request Multipart/form-data, also known as file upload.
NPM Install Multiparty
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