Using the enlarger
BMPsqueezer offers the option to enlarge the compressed image in the browser by clicking
on it. The applet will attempt to move the pixel clicked on into the
center of the display. If the cursor is dragged over the image then the image
will pan. Once the enlarge option is switched on there are various sub-options
that can be changed. Enlarging and hotlinking are mutually exclusive.
Scaled and original size
If the "enlarger (scaled)" option is selected then the image is displayed inside
a notional rectangle the dimensions of which are set in the "Enlarger scaled size"
panel. The original ratio of width to height of the image is kept when the scaling is done.
If the "enlarger (orig size)" option is selected then the original size of the image
is the starting dimension.
Percent enlargement per click
Each time the mouse is clicked over the image the image size grows by a percentage
value set by the this option.
Magnification
The current magnification of the image can be displayed in red at the top left corner
of the image by switching this option on. The magnification is always shown in the form
"1 : x.xxx". If the value of "x.xxx" is fractional then this indicates that the current
image size is less then the original. As "x.xxx" exceeds one the enlarged image is
bigger than the original.
Method of interpolating pixels
When the enlarging process means that the new image size is greater than the original then
there are two ways in which pixels can be interpolated. The replicate option simply
repeats the previous pixel color whereas area averaging will interpolate the pixel color.
Area averaging can be a slow process for larger images and the viewer may have to be
patient while the calculation is done.It should also be mentioned that when the
original image size is smaller than the scaled size then area averaging will not
operate until the enlarged image becomes greater in size than the original size. In
this case it is better to use the "enlarger (orig size)" option.
Status message shown on mouse over
When an image can be enlarged then the cursor will change to a cross-hair cursor
when it is over the image. In addition a message is displayed in the browser's status line
and this can be changed to any text that is required or can be left blank.
Resetting the enlarger
On multi-button mice, pressing any button except the first button will cause the applet
to reset so the image size goes back to it's original appearance. If a single button mouse
is in use then the browser refresh button should be pushed to get the same effect.