IDL>OpenW, lun, ’Format.dat’, /Get_Lun.......................................................................167
IDL>comm.=’ , ‘...................................................................................................................167
IDL>Free_lun,Lun...............................................................................................................167
从字符串中读取格式数据..........................................................................................................................167
读写非格式化数据........................................................................................................................168
读取非格式化图像数据文件......................................................................................................................168
IDL>filename=Filepath(Root_Dir=!Dir, $.........................................................................168
IDL>OpenR, lun, filename, /Get_Lun................................................................................168
写非格式化图像数据文件..........................................................................................................................169
IDL>Help, image, edge........................................................................................................169
IDL>fileInfo =’Sobel Edge Enhanced, 256 by 256 INTEGERS’.....................................169
IDL>strPut, header, fileInfo, 0............................................................................................169
非格式化数据文件的一些问题..................................................................................................................170
IDL>OpenW, lun, ‘process.dat’, /Get_Lun, /XDR............................................................171
用关联变量存取非格式化数据文件..........................................................................................................171
读写常用文件格式的文件............................................................................................................173
创建彩色 GIF 文件......................................................................................................................................173
IDL> TVLCT, [100,255,0], [100,255,255], [100,0,0], 0......................................................174
IDL> Plot, data, /NoData, Color=2, Background=0.........................................................174
IDL> TVCL, r, g, b, /Get......................................................................................................174
IDL> Write_GIF, ‘test.gif’, image, r, g, b...........................................................................174
IDL> Read_GIF, ‘test.gif’,thisImage, rr, gg, bb................................................................174
IDL> TV,thisImage...............................................................................................................175
IDL> TVCT, rr, gg, bb.........................................................................................................175
创建彩色 JPEG 文件...................................................................................................................................175
IDL> Write_JPEG, ‘test.jpg’, image3D, true=1, quality=75...........................................176
IDL> Read_JPEG, ‘test,jpg’, thisImage, colortable,$......................................................176
IDL> TVLCT,colortable......................................................................................................176
查询图像文件信息......................................................................................................................................176
IDL> Help, fileinfo, /Structure............................................................................................177
IDL> Print, fileinfo.dimensions...........................................................................................177
第七章 图形硬拷贝输出.......................................................................................................178
本章概要.......................................................................................................................................178
选择图形硬拷贝输出设备............................................................................................................178