scanheader

• purpose
• usage
• examples
• comments
• error messages
• see also

Purpose:

Displays information stored in an image header

Usage:

scanheader filename

where the following definitions apply:

filename

the name of the image file (.hdr or .img suffix optional)

Examples:

bits/pixel=16
x_dim=138
y_dim=170
z_dim=143
x_size=1.000000e+00
y_size=1.000000e+00
z_size=1.000000e+00

global maximum=32767
global minimum=0
		

• the number of bits/pixel, the matrix dimensions, the voxel sizes and the assigned global minimum and maximum of the file atlas15 are displayed

Comments:

• The header global minimum and maximum are not displayed for 8 bit images
• The fact that the header maximum is equal to a certain value does not guarantee that no voxel intensity exceeds this value. The header global maximum can be modified by the user with the program setheadermax.
• This program will allow for accurate display of values that are technically illegal (e.g., negative values for dimensions or sizes). The program fixheader will allow these illegal values to be set to their absolute values. Most other AIR programs will return errors when such illegal values are encountered.

Error messages: (alphabetical by case)

WARNING: Illegal dimension

• This .hdr file will generate errors with most AIR programs

WARNING: Illegal voxel size

• This .hdr file will generate errors with most AIR programs

WARNING: Note illegal values

• This .hdr file will generate errors with most AIR programs

See also:

• makeaheader
• setheadermax