JPEG Collager is a JPEG (and BMP) viewer which shows each
image in a window without any border. The best way to see
how it works is to play with it a bit, but here is a
summary of use. You can open any number of images. Each one
is manipulated individually. On the tool window in the
title bar you can see which image the mouse is currently
over. The active window (the one which will be affected by
operations) is indicated on the left of the status bar,
with its properties shown on the right. When you see the
icon become a hand, left dragging moves the window and
right dragging moves the image within the window (unless it
is stretched to fill the window). The window can be sized
by dragging the edges. The Stretch option causes the image
to fit the window. By default, Maintain Aspect Ratio is on.
This means that the picture will not be distorted but
resized to the height or width you select. For it to take
effect (visually), you do have to resize the window. If you
turn off Maintain Aspect Ratio, the image will be distorted
to fit whatever window size you choose. Right clicking a
window will give you a menu of options for the
window/image. The Color option allows you to select the
background color (behind the image). You can control
whether the tool window stays on top of everything or not
on the Window menu or the toolbar. You can also hide the
main window when you are ready to copy the screen. In many
cases it is easier to use keyboard hotkeys. These are shown
on the menus and in the hints for the toolbar buttons.
Pressing the Alt key or F10 will bring up the main menu of
the tool window. The simplest way to capture the collage is
to hit F12 to hide the tool window, then the Print Screen
key. Press Ctrl-N to create a new image window and Ctrl-V
to paste the collage. Then save it, of course.