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Diffstat (limited to 'man/blind-matrix-rotate.1')
| -rw-r--r-- | man/blind-matrix-rotate.1 | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/man/blind-matrix-rotate.1 b/man/blind-matrix-rotate.1 index 31ec330..3c82a3b 100644 --- a/man/blind-matrix-rotate.1 +++ b/man/blind-matrix-rotate.1 @@ -3,7 +3,7 @@ blind-matrix-rotate - Create an affine 2D-transformation matrix for rotation .SH SYNOPSIS .B blind-matrix-rotate -[-c] +[-cd] .SH DESCRIPTION .B blind-matrix-rotate creates an affine 2D-transformation matrix for @@ -28,9 +28,21 @@ Create different matrices for each channel. Use values from each channel in stdin to create matrices whose values are stored in the same channels in stdout. +.TP +.B -d +Input angles in degrees rather than radians. .SH NOTES The image is rotated anti-clockwise if the Y-axis grows upwards rather than downwards. +.P +Due to truncation error, when rotating a multiple +of 90 degrees, it is preferable to use +.B -d +with lets +.B blind-matrix-rotate +eliminate the error. If this is not done, +.BR blind-invert-matrix (1) +may return odd results. .SH SEE ALSO .BR blind (7), .BR blind-from-text (1), |