

		grayscale image sample		11-27-89
		Paul Raveling		Raveling@isi.edu


	This directory (img/grayscale) contains one sample
	grayscale image in color-mapped format.  It's a copy
	of a color image available on venera.isi.edu, converted
	to grayscale.

	After building and installing the Img Software Set,
	you can display this image with the following command:

		[cd <this directory>]
		dispimg grayscale_sample


	This image is a digitized photo of the Bell X-1E experimental
	rocket-powered aircraft, plus a joshua tree.  I took this
	photo earlier this year on a visit to the NASA Ames Dryden
	Flight Research Facility at Edwards Air Force Base.


	Conversion of this image from color to grayscale is an
	example of using several Img Software Set facilities.
	Steps were:

	1.  Display grayscale rendition of original RGB image, using
	    a private colormap.  Displaying on a 6-plane display
	    defaulted to a 64-color map.  The command to do this was:

	dispimg $img/color_rgb/x-1e -force grayscale -colormap private

	    This could have also been done with a previously
	    color-mapped copy of the image in $img/color_mapped;
	    however, using original 24-bit-per-pixel RGB data
	    assures maximum resolution.

	2.  Save the displayed image with:

	[cd .]
	savewin grayscale_sample

	    Savewin asks what window to save, grabs the mouse, and
	    changes the cursor.  An imglib bug discovered too late
	    to fix for version 1.1 requires that the window's color
	    map be installed in order to save it; in order to do
	    this, I invoked savewin and quickly moved the cursor
	    over the image's window to install its private color map
	    before savewin could grab the cursor.


	Other grayscale images are available by anonymous FTP from:

		Host:		venera.isi.edu
		Directory:	[~ftp/] images/grayscale

	A copy of the corresponding README file from this directory,
	current on this date, follows.



Original sources of images:

	[ISI has processed some in various ways other than color selection]

	Abbrev		Source			Medium
	------		------			------

	MIT	? (Host m9-520-1.mit.edu)	anonymous FTP
	ISI	several				mostly video disks, live camera
	UCB	UC Berkeley (DEC?)		Anonymous FTP
	UXE	? (Host uxe.cso.uiuc.edu)	anonymous FTP


Pixmap image files in this directory:

	Filename      Size, bytes    # Colors	Dimensions	Source
	--------      -----------    --------   ----------	------

	bearpee		120,217		220	 640 x 400	UXE
	boston		161,979		128	 512 x 432	UCB
	creationii	 54,050		 14	 604 x 355	MIT
	cs9		860,720		 73	1160 x 742	MIT
	dollar		133,417		 78	 868 x 372	MIT
	dragon1		 53,578		  8	 572 x 716	MIT
	drgw480		159,740		 74	1018 x 734	MIT
	edwinaldren	 64,779		  4	1090 x 1138	MIT
	einstein_1	 61,369		128	 300 x 300	UCB
	einstein_2	241,411		128	 600 x 600	UCB
	einstein_3	503,597		128	1020 x 1020	UCB
	eyes		  9,563		  5	 512 x 384	MIT
	isi-far		205,757		220	 512 x 512	ISI
	isi-near	192,283		220	 512 x 512	ISI
	kirk2		 90,061		 78	 398 x 556	MIT
	lennaface	 53,589		131	 256 x 256	ISI
	livingdaylights	 74,035		209	 400 x 640	MIT
	london		128,723		128	 512 x 432	UCB
	m1		127,413		165	 660 x 622	MIT
	mandelbrot	 46,355		128	 783 x 795	UCB
	miller		287,635		 86	1152 x 880	MIT
	mona_lisa	129,167		128	 432 x 512	UCB
	moon		114,629		128	 512 x 432	UCB
	owlman		 17,890		  8	 364 x 320	MIT
	reagan		234,097		128	 600 x 600	UCB
	san_fran	147,324		128	 512 x 432	UCB
	spock		106,859		 78	 490 x 642	MIT
	sr71		119,083		 77	1140 x 406	MIT
	steinheim	 73,499		 22	 510 x 402	MIT
	surfer		181,335		 74	 922 x 776	MIT
	twentydollar	127,117		 78	 888 x 384	MIT
	unicorn		 50,681		 27	 640 x 400	MIT
	venus		 85,783		 14	 679 x 388	MIT

