2.2.7. imageData

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Purpose

Generate PNG image from data in given column (or 2D data of overall table).

Usage

> imageData options file[s] 

Options

-l / --label [ all ]

column containing data

-r / --range [ auto ]

data range (min max)

--gap=float / --transparent [ none ]

value to treat as transparent

-d / --dimension [ native ]

data dimension (width height)

--color [ gray ]

color scheme

--invert

invert color scheme

--abs

magnitude of values

--log

log10 of values

--fliplr

flip around vertical axis

--flipud

flip around horizontal axis

--crop

pixels cropped on left, right, top, bottom

-N / --pixelsize

pixel per data point

-x / --pixelsizex

pixel per data point along x

-y / --pixelsizey

pixel per data point along y

--show

show resulting image

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Example

Single data column

Suppose we have an ASCIItable that contains a column of two-dimensional data as in » type « below. The additional columns » x « and » y « are not required and not considered either, but correspond to the interpretation of the data sequence based on --dimension 3 2, i.e. 3 points along x for each of two rows along y.

1 head
x y type
1 1 1
2 1 1
3 1 2
1 2 1
2 2 3
3 2 0

With

> imageData --label type --pixelsize 10 --dimension 3 2

the output shown in Figure 1 results.

Two-dimensional data array

For an ASCIItable that directly contains a two-dimensional representation of a data field, such as

0 head
-1    0 0 0 0 0 0 0
-0.33 0 0 2 0 2 0 0
0.33  0 0 0 0 0 0 0
1     0 0 0 2 0 0 0
1.67  0 1 0 0 0 1 0
2.33  0 0 2 2 2 0 0
3     0 0 0 0 0 0 0

the processing with

> imageData --pixelsizex 10 --pixelsizey 15 --color bluered --invert --range -1 3

yields the output shown in Figure 2.