grey_convert

Image [GreyScale] grey_convert (IntVector newgrey)

Converts grey values to the new values provided in the vector newgrey, i.e. val is replaced by newgrey[val].

As this is only implemented for greyscale images, the vector newgrey must be of size 256 and all entries must be in [0,255].

Example 1: grey_convert([255, 254, 253, 252, 251, 250, 249, 248, 247, 246, 245, 244, 243, 242, 241, 240, 239, 238, 237, 236, 235, 234, 233, 232, 231, 230, 229, 228, 227, 226, 225, 224, 223, 222, 221, 220, 219, 218, 217, 216, 215, 214, 213, 212, 211, 210, 209, 208, 207, 206, 205, 204, 203, 202, 201, 200, 199, 198, 197, 196, 195, 194, 193, 192, 191, 190, 189, 188, 187, 186, 185, 184, 183, 182, 181, 180, 179, 178, 177, 176, 175, 174, 173, 172, 171, 170, 169, 168, 167, 166, 165, 164, 163, 162, 161, 160, 159, 158, 157, 156, 155, 154, 153, 152, 151, 150, 149, 148, 147, 146, 145, 144, 143, 142, 141, 140, 139, 138, 137, 136, 135, 134, 133, 132, 131, 130, 129, 128, 127, 126, 125, 124, 123, 122, 121, 120, 119, 118, 117, 116, 115, 114, 113, 112, 111, 110, 109, 108, 107, 106, 105, 104, 103, 102, 101, 100, 99, 98, 97, 96, 95, 94, 93, 92, 91, 90, 89, 88, 87, 86, 85, 84, 83, 82, 81, 80, 79, 78, 77, 76, 75, 74, 73, 72, 71, 70, 69, 68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0])

mirror_horizontal

mirror_horizontal ()

Flips the image across the horizontal (x) axis.

Example 1: mirror_horizontal()

mirror_vertical

mirror_vertical ()

Flips the image across the vertical (y) axis.

Example 1: mirror_vertical()

resize

Image [OneBit|GreyScale|Grey16|RGB|Float|Complex] resize (Dim dim, Choice [None|Linear|Spline] interp_type)

Returns a resized copy of an image. In addition to size, the type of interpolation can be specified, with a tradeoff between speed and quality.

If you need to maintain the aspect ratio of the original image, consider using scale instead.

dim

The size of the resulting image.

interp_type [None|Linear|Spline]

The type of interpolation used to resize the image. Each option is progressively higher quality, yet slower.

rotate

Image [OneBit|GreyScale|Grey16|RGB|Float|Complex] rotate (float(-180.00, 180.00) angle, Pixel bgcolor = None, int(1, 3) order = 1)

Rotates an image.

angle

The angle of rotation (in degrees)

bgcolor

The color to use for pixels outside of the original image bounds. When bgcolor is None, white is used.

order

The order of the spline used for interpolation. Must be between 1 - 3.

Example 1: rotate(32.0, (255, 255, 255), 3)

Example 2: rotate(15.0, 0j, 3)

scale

Image [OneBit|GreyScale|Grey16|RGB|Float|Complex] scale (float scaling, Choice [None|Linear|Spline] interp_type)

Returns a scaled copy of the image. In addition to scale, the type of interpolation can be specified, with a tradeoff between speed and quality.

If you need to change the aspect ratio of the original image, consider using resize instead.

scale

A scaling factor. Values greater than 1 will result in a larger image. Values less than 1 will result in a smaller image.

interp_type [None|Linear|Spline]

The type of interpolation used to resize the image. Each option is progressively higher quality, yet slower.

Example 1: scale(0.5, 2)

Example 2: scale(2.0, 2)

shear_column

shear_column (int column, int distance)

Shears a given column by a given amount.

column

The column number to shear.

distance

The number of pixels to move the column. Positive values move the column downward. Negative values move the column upward.

Example 1: shear_column(50, 10)

shear_row

shear_row (int row, int distance)

Shears a given row by a given amount.

row

The row number to shear.

distance

The number of pixels to move the row. Positive values move the row to the right. Negative values move the row to the left.

Example 1: shear_row(50, 10)