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How
do I rotate only one of the two images (left/right) at a time?
If you are creating stereoscopic images from left and right images
taken from a
non-stereoscopic camera, you will probably need to rotate, with a very
small angle, only one of the two images to fine tune the stereoscopic
effect. Since the Rotate tool always applies to both images
at the same time, the only way to make this fine tuning is by doing it in
several operations. First create a stereoscopic image by specifying
your left image file for both left and right images. Rotate it with
the No Resize radio button selected and the Anti-aliasing
check box selected. Save only the left image under a temporary file
name. Create another stereoscopic image by specifying the temporary
image file for the left image and your right image file for the right
image. Use the Align tool to align the left and right
images. If you are not satisfied with the result, close the second
stereoscopic image without saving, then in the first stereoscopic image,
click the Undo button and rotate the image again with another angle
and redo the same other steps.
How do I know if an image file without a
sTER chunk is compatible with the Stereoscopic PNG Image Format
Specifications and how do I calculate the real stereoscopic image width
from an image file width?
You can not simply divide the image file width by 2 because some
padding pixels may have been inserted. First thing to do is to
verify that the image file width is 9 or greater. If it is less than
9, then this image file is not a compatible stereoscopic image. Then
we calculate the padding width by doing a modulo 8 on the image file
width. If the result is 0, then the padding width is 0. If the
result is not 0, then subtract it from 8 to get the padding width.
Then subtract the padding pixels width from the image file width, then
divide the result by 2 to get the real stereoscopic image width.
Finally we test the calculated real stereoscopic image width by adding the
padding width to it, then doing a modulo 8 to the sum. If the result
is not 0, then the image file is not compatible with the Stereoscopic PNG
Image Format Specifications.
Why
are my Stereoscopic PNG files, saved with the Stereo Image Maker version 1.0.1,
no more recognized?
Stereo Image Maker version 1.0.1 was an application created to demonstrate
the utility of the private Stereoscopic PNG chunk named stER. The
stER chunk specifications have been debated in the png-list mailing list
and after a lot of constructive discussions, the official specifications
of the public sTER chunk have been writen. The Stereo Image
Maker version 1.1.1 application is now using the public sTER chunk.
Since the private and public stereoscopic chunk specifications are not
compatible, I have decided to make Stereo Image Maker version 1.1.1
ignoring any private stER chunk from existing PNG files. However,
when you try to load a v1.0.1 Stereoscopic PNG file (or BMP or JPG or JPS), the
new Import Stereo Image With Unrecognized Format
dialog box opens automatically to allow you to specify a stereoscopic format
that will be used by the decoder. So to load a v1.0.1 Stereoscopic PNG
file, simply select the radio button named Stereoscopic PNG format.
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