iBWAutoContrast - uses actual min and max [1027296]

< > BotCompany Repo | #1027296 // iBWAutoContrast - uses actual min and max

JavaX fragment (include) [tags: use-pretranspiled]

Transpiled version (5123L) is out of date.

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

// def value is usually irrelevant
static BWImage iBWAutoContrast(IBWImage 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.getFloatPixel(x, y);
    min = min(min, f);
    max = max(max, f);
  }
  if (min == max) ret new BWImage(w, h, def);
  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.getFloatPixel(x, y)-min)*factor);
  ret bw2;
}

Author comment

Began life as a copy of #1015507

Travelled to 7 computer(s): bhatertpkbcr, mqqgnosmbjvj, pyentgdyhuwx, pzhvpgtvlbxg, tvejysmllsmz, vouqrxazstgt, xrpafgyirdlv

Snippet ID:

#1027296

Snippet name:

iBWAutoContrast - uses actual min and max

Eternal ID of this version:

#1027296/4

Text MD5:

c84acc2120f703847e7a36cd70faf024

Author:

stefan

Category:

javax / imaging

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2020-03-01 00:02:49

Source code size:

624 bytes / 21 lines

Pitched / IR pitched:

No / No

Views / Downloads:

429 / 558

Version history:

3 change(s)

Referenced in:

[show references]

1	static BWImage iBWAutoContrast(IBWImage bw) {
2	ret iBWAutoContrast(bw, 0f);
3	}
4
5	// def value is usually irrelevant
6	static BWImage iBWAutoContrast(IBWImage 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.getFloatPixel(x, y);
12	min = min(min, f);
13	max = max(max, f);
14	}
15	if (min == max) ret new BWImage(w, h, def);
16	float factor = floatRatio(1, max-min);
17	BWImage bw2 = new BWImage(w, h);
18	for y to h: for x to w:
19	bw2.setPixel(x, y, (bw.getFloatPixel(x, y)-min)*factor);
20	ret bw2;
21	}