thank you so much Fred, that did the trick!  A follow-up question if you
know it,

I am noticing some weirdness in the rendered image.  What I mean is, the
colors are not right.  I have a solid green color of #48BD60 on my
original (pre-joined) images... however, the joined output is not
percisely this value.... it is close, but at least 3 or 4 variations of
that hex code are in the output file :(  Do you know why this may be the
case?  Is there some setting to make it create a perfect rendition?



That is because you have taken two jpg images and created another jpg image. Each time you create a new jpg there is some further compression. IM compresses by default about 80% quality. So you change the colors some. The best thing would be to take your original images and form a new one in a different format such as png which does not compress by default. Alternately you can tell IM to make the final image at 100% quality level.

convert image1.jpg image2.jpg +append image3.png

convert image1.jpg image2.jpg +append -quality 100 image3.jpg


See the documentation that Anthony Thyssen has developed at

http://www.imagemagick.org/Usage/reference.html
http://www.imagemagick.org/Usage/

and of course also

http://www.imagemagick.org/script/command-line-options.php


Lastly, I had one seperate question which should shore me up. (Thank you
for this group---and your time!).  Let's say I have a single 200x200
image, and want to create a 300x200 image using that 200x200 image,
centered within that new space, & with a specified color value for it
(the extra 50 pixels on each side of the input image being created).  How
would this be done? :-) :-)


convert image1.jpg -bordercolor "whatevercolor" -border 50x50 image2.jpg

for colors see

http://www.imagemagick.org/script/command-line-options.php#fill
http://imagemagick.org/script/color.php


also another place to get help is at

http://www.imagemagick.org/discourse-server/



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