bwAutoContrast - uses actual min and max [1015507]

< > BotCompany Repo | #1015507 // bwAutoContrast - uses actual min and max

JavaX fragment (include)

static BWImage bwAutoContrast(BWImage bw) {
  ret bwAutoContrast(bw, 0f);
}

// def value is usually irrelevant
static BWImage bwAutoContrast(BWImage bw, float def) {
  if (bw == null) null;
  int w = bw.getWidth(), h = bw.getHeight();
  float min = 1, max = 0;
  for y to h: for x to w: {
    float f = bw.getPixel(x, y);
    min = min(min, f);
    max = max(max, f);
  }
  if (min == max) ret new BWImage(w, h, def);
  if (min == 0 && max == 1) ret bw;
  float factor = floatRatio(1, max-min);
  BWImage bw2 = new BWImage(w, h);
  for y to h: for x to w:
    bw2.setPixel(x, y, (bw.getPixel(x, y)-min)*factor);
  ret bw2;
}

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Snippet ID:

#1015507

Snippet name:

bwAutoContrast - uses actual min and max

Eternal ID of this version:

#1015507/8

Text MD5:

3e2b82135c6790e0fa392c53c3ab4e12

Author:

stefan

Category:

javax / imaging

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2018-10-14 23:36:30

Source code size:

646 bytes / 22 lines

Pitched / IR pitched:

No / No

Views / Downloads:

422 / 435

Version history:

7 change(s)

Referenced in:

[show references]

1	static BWImage bwAutoContrast(BWImage bw) {
2	ret bwAutoContrast(bw, 0f);
3	}
4
5	// def value is usually irrelevant
6	static BWImage bwAutoContrast(BWImage bw, float def) {
7	if (bw == null) null;
8	int w = bw.getWidth(), h = bw.getHeight();
9	float min = 1, max = 0;
10	for y to h: for x to w: {
11	float f = bw.getPixel(x, y);
12	min = min(min, f);
13	max = max(max, f);
14	}
15	if (min == max) ret new BWImage(w, h, def);
16	if (min == 0 && max == 1) ret bw;
17	float factor = floatRatio(1, max-min);
18	BWImage bw2 = new BWImage(w, h);
19	for y to h: for x to w:
20	bw2.setPixel(x, y, (bw.getPixel(x, y)-min)*factor);
21	ret bw2;
22	}