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<body class='hmmessage'><div dir='ltr'>The following code retrieves the 16 bit geotiff image data, and puts it into a 8bit image for testing. The resulting 8 bit image has banding which implies that i did something wrong. <BR> <BR> <BR> long testwidth = 2048;//output 8 bit image size<br> long size = TIFFScanlineSize(tif);<br> long Index,Index3;<br> unsigned char* scanline = (unsigned char *) _TIFFmalloc(size);//input<br> unsigned char* pimage = (unsigned char *) malloc(testwidth*testwidth*3);//output<br> unsigned char Color;<br> long x,y;<br> for(y=0;y<testwidth;y++)<br> {<br> TIFFReadScanline(tif, scanline, y, 0);<br> for(x=0;x<testwidth;x++)<br> {<br> Index3 = y*testwidth*3+x*3;<br> Index = x*2;<br><BR> //Color = ((scanline[Index+0]<<8)+scanline[Index+1])/256;<br> Color = scanline[Index+0];//both the same<BR> <BR> pimage[Index3+0] = Color;<br> pimage[Index3+1] = Color;<br> pimage[Index3+2] = Color;<br> }<br> }<br><BR>Am i doing something wrong, or do i not understand something?<BR>please help!!!<BR> <BR>thanks<BR>jeff<BR> </div></body>
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