function SmartcropTestCase::mean in Smart Crop 7

Same name and namespace in other branches

1. 6 tests/smartcrop.test \SmartcropTestCase::mean()

Calculate the mean pixel intensity.

Parameters

$image GD image resource.:

Return value

The mean.

2 calls to SmartcropTestCase::mean()

SmartcropTestCase::assertImageEqual in tests/smartcrop.test

Assert that two images are the same, with some difference allowed to account for e.g. compression artifacts.

SmartcropTestCase::assertImageNotEqual in tests/smartcrop.test

Assert that two images are not the same, with some difference allowed to account for e.g. compression artifacts.

File

tests/smartcrop.test, line 208

Tests for the smartcrop module.

Class

SmartcropTestCase

@file Tests for the smartcrop module.

Code

function mean($image) {
  $mean = 0;
  $size = imagesx($image) * imagesy($image) * 3;
  for ($i = 0; $i < imagesx($image); $i++) {
    for ($j = 0; $j < imagesy($image); $j++) {
      $rgb = imagecolorat($image, $i, $j);
      $r = $rgb >> 16 & 0xff;
      $g = $rgb >> 8 & 0xff;
      $b = $rgb & 0xff;
      $mean += $r / $size;
      $mean += $g / $size;
      $mean += $b / $size;
    }
  }
  return $mean;
}