Edit Pixel Mask
The Edit Pixel Mask command is used to view or input the coordinates of bad pixels. A bad pixel list is used by the Apply Pixel Mask command to repair hot and cold pixels. This editor creates a pixel description mask named in the Profile field. Use this tool to create new pixel masks or to review and edit masks created using the Create Pixel Mask command.
Open the Pixel Mask Editor from the Process > Cosmetics menu.
The Pixel Mask Editor is a resizable Table Editor window. The Mask file current loaded is listed in the drop edit field at the top of the window.
Type X (column) and Y (row) coordinates for each pixel location on a separate line of the table. The Notes entry is optional.
The editor adds lines in chunks of 100. If you run to the end of the buffer, right click on the table to open its context menu and select Append Rows. Then continue entering mask data.
Save your changes (see below).
Click 
on the right end of
the Pixel Mask File field. Select the
pixel mask file and click [Open] to
load the pixel mask.
Edit (x,y) pixel coordinates as needed. Note that the editor adds lines in chunks of 100. If you run to the end of the buffer, right click on the table to open its context menu and select Append Rows. Then continue entering pixel coordinate data.
Save Changes (see below).
When you are finished entering data for a pixel mask, save using one of these methods:
Click [Apply] to save to the original file.
Click the 
button to save
it to a new file or a different file.
A pixel mask is simply a collection of point locations in an image. When a pixel mask is applied to an image, the value at each mask coordinate is replaced by a value obtained from the neighboring pixels. This technique is used to repair defective pixels or "hot" pixels caused by thermal noise in CCD images. If the bad pixel locations do not change, then the same mask can be used for many images on different occasions.
A Pixel Mask is usually stored in a file with a
pxm extension, like
Pixel-mask.pxm, although txt or
any other extension is possible. Each line describes the
coordinates of 1 pixel. The Notes
column holds an optional comment.
|
Note |
Remember that coordinates in Mira are 1-based, meaning that pixel (1,1) is the origin of the image array. See Image Coordinate System and Pixel Coordinate Definition. |
Create Pixel Mask, Apply Pixel Mask, Edit Blemish Mask, Image Calibration, Image Coordinate System, Repairing Artifacts and Cosmetic Defects