2.2.7. imageData


Purpose

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

parent_gray

Usage

> imageData options file[s] 

parent_gray

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


parent_gray

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.
output of imageData
Figure 1: Exemplary output of the » type « column as two-dimensional image.
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
output of imageData
Figure 2: Exemplary output of the 8 by 7 data array as (distorted) image.
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.

Topic attachments
I Attachment Action Size Date Who Comment
face.pngpng face.png manage 370 bytes 01 May 2015 - 17:55 PhilipEisenlohr output of imageData
image_type.pngpng image_type.png manage 114 bytes 01 May 2015 - 01:58 PhilipEisenlohr output of imageData
Topic revision: r5 - 07 Mar 2019, MartinDiehl


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