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+		General information - GIF utilities
+		-----------------------------------
+
+  Each of the utilities provided in 'util' directory perform some kind of
+filtering, generating new image, or dumping it to a device.
+
+  Because they are not fast, a filter will print (in increasing) order the
+current input image line number, any time it needs to read the input, and
+will print output image line number (in decreasing order) any time it dumps
+out. Other utilities, that only read or write, will always print that half
+the same way (but in increasing order). This is true only for utilities
+that decodes the data. Utilities (like GifPos that only change positions)
+that copies the image as block of compressed data, will print nothing for
+two reasons: they can not idetify line number, and mainly as they are much
+faster.
+
+  Some of the utilities requirs memory in the order of the whole screen, while
+others read one scan line at a time. Each utility DOC file, has entry called
+'Memory Usage' which will be one of: Line (memory required is in the order
+of one scan line), Image (order of biggest image in GIF file), or Screen (order
+of GIF file screen). In all cases, a byte is allocated per pixel, so image of
+320 by 200 pixels will requires ~64k bytes to hold.