12.1.10.1.6. Convert falseColor

This demo shows how colored images are converted into other color spaces..

img1 contains an rgba-image with false color encoded color information and gray values the gray values stay like they are, the false color values are decoded in HSV color space and gray values with respect to their hue are determined. The resulting image is called img2.

import colorsys
import itom
from itom import dataObject
from itom import plot


img1 = dataObject.rand([200, 200], "rgba32")
[height, width] = img1.shape
img2 = img1.copy()

plot(img1)

(110, PlotItem(UiItem(class: Itom2dQwtPlot, name: plot0x0)))

for m in range(height):
    for n in range(width):
        px = img1[m, n]
        [h, s, v] = colorsys.rgb_to_hsv(px.r / 255.0, px.g / 255.0, px.b / 255.0)
        if s > 0.3:
            h_ = int(v * h * 255)
            img2[m, n] = itom.rgba(h_, h_, h_)

img1 contains an rgba-image with false color encoded color information and gray values the gray values stay like they are, the false color values are decoded in HSV color space and gray values with respect to their hue are determined. The resulting image is called img2

[height, width] = img1.shape
img2 = img1.copy()

result_map = "hotIron"  # 'gray' or 'hotIron'

if result_map == "hotIron":
    map = []
    for i in range(0, 256):
        map.append(itom.rgba(i, 0, 0))
    for i in range(0, 256):
        map.append(itom.rgba(255, i, 0))
    for i in range(0, 256):
        map.append(itom.rgba(255, 255, i))
    map_len = len(map)

for m in range(height):
    for n in range(width):
        px = img1[m, n]
        [h, s, v] = colorsys.rgb_to_hsv(px.r / 255.0, px.g / 255.0, px.b / 255.0)
        if s > 0.3:
            if result_map == "gray":
                h_ = int(v * h * 255)
                img2[m, n] = itom.rgba(h_, h_, h_)
            elif result_map == "hotIron":
                s_ = int(v * 255)
                img2[m, n] = map[int(h * map_len)] * itom.rgba(s_, s_, s_)
            else:
                raise RuntimeError("map must be gray or hotIron")

plot(img2)

(111, PlotItem(UiItem(class: Itom2dQwtPlot, name: plot0x0)))