一个GIF图形格式的图像创建Perl子库

The dGIFLZW is a single file perl subroutine collection for creation of GIF images on a per-pixel basis. Mainly it provides three subs for initializing the image file generating the GIF header, adding the pixels to the image and finally saving the complete image file. The code is very small and it don"t need any Perl module or package: just copy or include it into your program and use it. I choosen to write an auto explaining code, so the program may be optimized but in this form it is very useful for understanding how it works. The dGIFLZW was initially part of the DiGiTrip.it project (http://www.digitrip.it/index.php/en/10/content.html), a nautical navigation & GPS program working on Win, Mac and Linux written in Perl/Tk.