Stack tab
This tab is used to control the stacking process :
- The "x" an "y" numeric fields set the origin (in pixels unit) of the
crop rectangle (0,0 is at the bottom left corner).
The rectangle position can also be (and usually is) changed by
dragging it in the image frame.
- The "w" and "h" numeric fields set the width and height of the crop
rectangle.
The rectangle size can also be (and usually is) changed by
dragging its corners or border in the image frame, if the rectangle
is not drawn, it can be created by dragging the mouse in the
image.
The crop rectangle is the region of the image which will be stacked
in the final image. Parts of the image outside of the rectangle will
be discarded.
- The "Double size" checkbox makes the stacked image be twice the size of
the crop rectangle. As the stacking is done with sub-pixel accuracy,
there is no pixellisation in the result.
- The "Monochrome" checkbox is used only when stacking flat field
frames. It makes the stacked flat field monochrome ; which is very
useful when your flat fields are color biased. If, for example, you use
images of the daytime sky (any similarities with my past tries would
be pure coincidence
).
- The "Stack" button starts to stack each image selected for
processing (ie: with a checkmark) in the (almost) final image.
Once started, it is impossible to select another tab and the "Stack"
button becomes a "Stop" button.
When working on dark frames or flat fields, the x, y, w, h fields
are disabled and frame the entire image.
When this tab is selected, the image frame displays the reference image.
The crop rectangle is drawn in red on this image.
During the stacking process, each image, once added to the stack, is
highlighted in the list frame.
Process tab ...