The libjpeg library allows your C code to read, write, and manipulate image data stored in JPEG files. The image data is compressed, so the library decompresses images as they're read and compresses images as they're written. Once read, the image data can be manipulated in memory.
- [Man] The C language isn't known for its graphics prowess … unless you install a library that can access graphical data. … For reading and writing JPEG images … one such library is libjpeg. … Its home is here on GitHub … at https://github.com/windower/libjpeg … Now the documentation is good, and you can find plenty … of sample code to peruse. … You can install libjpeg from here … or you can use the shell's package manager to install … and the package you want to install is libjpeg62-dev. … Here is test code which you can build and run … to confirm the libjpeg installation. … It outputs the library's version number. … At the command prompt, type clang or the compiler name … such as GCC or CC and I specify the Wall switch … to turn all the warnings. … You link in the JPEG library right there … and then you type the source code file name. … And it compiles and links with no errors or warnings … so to run, and you see libjpeg version 62 here … the version number on your output may be different. …
Author
Dan Gookin
Released
10/1/2019- Finding, installing, and linking libraries
- Accessing and generating XML data
- Working with JSON
- Working with the libcurl library
- Text programming
- Reading, writing, and manipulating JPEG images
- Working with PNG images
Skill Level Advanced
Duration
Views
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Introduction
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Using the exercise files1m 2s
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Working with the code2m 45s
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1. Setup and Configuration
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Understanding libraries2m 50s
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Finding a C library2m 44s
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Installing a library4m 15s
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Liking a library: IDE4m 10s
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2. Data Structures
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Understanding XML2m 23s
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Accessing XML data3m 26s
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Generating XML data3m 57s
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Working with JSON2m 39s
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Accessing JSON data3m 10s
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Reading JSON data3m 46s
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Creating JSON output3m 35s
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3. Web Access
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Testing libcurl2m 3s
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Fetching a web page3m 47s
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Saving web data3m 31s
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Sending data2m 35s
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4. Text Programming
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Working with wide characters3m 19s
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Building an ncurses program2m 27s
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Controlling the text screen2m 32s
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Making color text2m 56s
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Exploring ncurses input4m 6s
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5. Computer Graphics
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Accessing a JPEG2m 31s
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Manipulating JPEG images3m 5s
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Working with PNG images3m 57s
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Modifying a PNG image2m 26s
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Conclusion
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Writing your own library4m 19s
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Next steps1m 17s
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Video: Accessing a JPEG