CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 OBJECT = TEXT PUBLICATION_DATE = 1992-01-15 NOTE = "Description of the Macintosh II image display software." END_OBJECT = TEXT END Macintosh NIH IMAGE Software This directory contains NIH Image, a public domain program written by Wayne Rasband of the National Institutes of Health. This version of NIH Image has been modified to directly read images with PDS (Planetary Data System) labels (such as the files which end in '.LBL') on the Magellan CD-ROMs or '.IMG' and '.IBG' in other collections). It will also directly read VICAR format images which are found on Magellan and Galileo Imaging CD-ROMs (labelled '.IMG'). It will also read SOME Compuserve GIF format images, specifically, the color images on MDIM Volume 14. When using System 6 image should be run under Finder for best results. When running under multifinder, the memory allocated to Image should be set as high as possible (at least 9000K to display an FMAP tile), using the Macintosh 'Get Info' command in the 'File' menu. Image has a preferences file which sets certain display parameters.The preference settings are found in the 'Other' menu. You should make sure the 'Invert Y Coordinates' box is checked in your preference settings. The 'Invert Displayed Pixel Values' box should NOT be checked. Image normally works with a gray scale palette using 0 as white and 255 as black. This version has been modified to use 1 as black and 254 as white, with 0 and 255 reserved, and set to white and black respectively. When PDS images are loaded any samples with value 0 are set to 1 and samples with value 255 are set to 254. Most of the operations which modify pixel values (remove noise, sharpen, etc) have been modifed to work in the range 1 to 254. As a result of these modifications some palette operations may give unpredictable results and some gray level settings will make the screen display (menu bars, etc) hard to read. The 'values' status display has been modified to show both the x,y coordinates and the latitude and longitude of the cursor position for data sets which have map projection label information (such as the Magellan and Digital Image Map CD-ROMs). The data value at the cursor position is now given both as a pixel value and also in geophysical terms, if such conversions are specified in the labels. For example, the Mars Digital Topographic Map displays the scaled altitude value in meters. NOTE: The Compuserve GIF format images on Volume VO_2014 do not contain coordinate information thus the values display will not show latitude and longitude for these images. When loading 16 bit images, the low and high samples are used to scale the output between 1 and 254. To set a fixed scale (for use with Pre- Magellan lunar images for example), select IMPORT in the FILE menu, and click on the edit button. Enter the low and high values for scaling then click CANCEL. Now open the 16-bit image and values will be scaled in the desired range.