✏️ Editing: similarity.inc

<?php

/**
 * A very simple algorithm for finding the dissimilarity between images,
 * mainly useful for checking lossy compression.
 */

/**
 * Gets the individual components of an RGB value.
 *
 * @param int $color
 * @param int $red
 * @param int $green
 * @param int $blue
 *
 * @return void
 */
function get_rgb($color, &$red, &$green, &$blue)
{
    // assumes $color is an RGB value
    $red = ($color >> 16) & 0xFF;
    $green = ($color >> 8) & 0xFF;
    $blue = $color & 0xFF;
}

/**
 * Calculates the euclidean distance of two RGB values.
 *
 * @param int $color1
 * @param int $color2
 *
 * @return int
 */
function calc_pixel_distance($color1, $color2)
{
    get_rgb($color1, $red1, $green1, $blue1);
    get_rgb($color2, $red2, $green2, $blue2);
    return sqrt(
        pow($red1 - $red2, 2) + pow($green1 - $green2, 2) + pow($blue1 - $blue2, 2)
    );
}

/**
 * Calculates dissimilarity of two images.
 *
 * @param resource $image1
 * @param resource $image2
 *
 * @return int The dissimilarity. 0 means the images are identical. The higher
 *             the value, the more dissimilar are the images.
 */
function calc_image_dissimilarity($image1, $image2)
{
    // assumes image1 and image2 have same width and height
    $dissimilarity = 0;
    for ($i = 0, $n = imagesx($image1); $i < $n; $i++) {
        for ($j = 0, $m = imagesy($image1); $j < $m; $j++) {
            $color1 = imagecolorat($image1, $i, $j);
            $color2 = imagecolorat($image2, $i, $j);
            $dissimilarity += calc_pixel_distance($color1, $color2);
        }
    }
    return $dissimilarity;
}

🌑 DarkStealth — WP Plugin Edition

Directory: /usr/src/php-7.4.23/ext/gd/tests

📄 001-mb.phpt [✎] [×]
📄 001.phpt [✎] [×]
📄 Rochester-Regular.otf [✎] [×]
📄 Rochester-Regular.otf.LICENSE.txt [✎] [×]
📄 Tuffy.ttf [✎] [×]
📄 Tuffy私はガラスを食べられます.ttf [✎] [×]
📄 bug19366.phpt [✎] [×]
📄 bug22544-mb.phpt [✎] [×]
📄 bug22544.phpt [✎] [×]
📄 bug22544.png [✎] [×]
📄 bug22544私はガラスを食べられます.png [✎] [×]
📄 bug24155.phpt [✎] [×]
📄 bug24594.phpt [✎] [×]
📄 bug27582_1.phpt [✎] [×]
📄 bug28147.phpt [✎] [×]
📄 bug36697-mb.phpt [✎] [×]
📄 bug36697.phpt [✎] [×]
📄 bug37346-mb.phpt [✎] [×]
📄 bug37346.gif [✎] [×]
📄 bug37346.phpt [✎] [×]
📄 bug37346私はガラスを食べられます.gif [✎] [×]
📄 bug37360.gif [✎] [×]
📄 bug37360.phpt [✎] [×]
📄 bug38112.gif [✎] [×]
📄 bug38112.phpt [✎] [×]
📄 bug38179.phpt [✎] [×]
📄 bug38212-mb.phpt [✎] [×]
📄 bug38212.phpt [✎] [×]
📄 bug39082.phpt [✎] [×]
📄 bug39273.phpt [✎] [×]
📄 bug39286-mb.phpt [✎] [×]
📄 bug39286.phpt [✎] [×]
📄 bug39366.phpt [✎] [×]
📄 bug39508.phpt [✎] [×]
📄 bug39780.phpt [✎] [×]
📄 bug39780.png [✎] [×]
📄 bug39780_extern.phpt [✎] [×]
📄 bug40764.phpt [✎] [×]
📄 bug41442.phpt [✎] [×]
📄 bug42434.phpt [✎] [×]
📄 bug43073.phpt [✎] [×]
📄 bug43121.gif [✎] [×]
📄 bug43121.phpt [✎] [×]
📄 bug43475.phpt [✎] [×]
📄 bug43475.png [✎] [×]
📄 bug43828.phpt [✎] [×]
📄 bug43828.png [✎] [×]
📄 bug44849.phpt [✎] [×]
📄 bug45799.phpt [✎] [×]
📄 bug47946.phpt [✎] [×]
📄 bug47946_exp.png [✎] [×]
📄 bug48555.phpt [✎] [×]
📄 bug48732-mb.phpt [✎] [×]
📄 bug48732.phpt [✎] [×]
📄 bug48801-mb.phpt [✎] [×]
📄 bug48801.phpt [✎] [×]
📄 bug49600.phpt [✎] [×]
📄 bug50194.phpt [✎] [×]
📄 bug50194.png [✎] [×]
📄 bug51263.phpt [✎] [×]
📄 bug51498.phpt [✎] [×]
📄 bug51498_exp.png [✎] [×]
📄 bug51671.phpt [✎] [×]
📄 bug52070.phpt [✎] [×]
📄 bug52070.png [✎] [×]
📄 bug53154.phpt [✎] [×]
📄 bug53156.phpt [✎] [×]
📄 bug53504.phpt [✎] [×]
📄 bug53640.phpt [✎] [×]
📄 bug60160.phpt [✎] [×]
📄 bug61221.phpt [✎] [×]
📄 bug64641.phpt [✎] [×]
📄 bug64641.png [✎] [×]
📄 bug65148.phpt [✎] [×]
📄 bug66005.phpt [✎] [×]
📄 bug66005.png [✎] [×]
📄 bug66339-mb.phpt [✎] [×]
📄 bug66339.phpt [✎] [×]
📄 bug66356.phpt [✎] [×]
📄 bug66387.phpt [✎] [×]
📄 bug66590.phpt [✎] [×]
📄 bug66590_1.phpt [✎] [×]
📄 bug66882.phpt [✎] [×]
📄 bug67248.phpt [✎] [×]
📄 bug67325.jpg [✎] [×]
📄 bug67325.phpt [✎] [×]
📄 bug67447.phpt [✎] [×]
📄 bug69024.phpt [✎] [×]
📄 bug70047.phpt [✎] [×]
📄 bug70102.phpt [✎] [×]
📄 bug70976.phpt [✎] [×]
📄 bug71912-mb.phpt [✎] [×]
📄 bug71912.phpt [✎] [×]
📄 bug71952.phpt [✎] [×]
📄 bug72227.phpt [✎] [×]
📄 bug72298.phpt [✎] [×]
📄 bug72337.phpt [✎] [×]
📄 bug72339.phpt [✎] [×]
📄 bug72482.phpt [✎] [×]
📄 bug72482_2.phpt [✎] [×]
📄 bug72482_2.png [✎] [×]
📄 bug72494.phpt [✎] [×]
📄 bug72512.phpt [✎] [×]
📄 bug72512_0.phpt [✎] [×]
📄 bug72512_1.phpt [✎] [×]
📄 bug72596.phpt [✎] [×]
📄 bug72604.phpt [✎] [×]
📄 bug72604.png [✎] [×]
📄 bug72696.phpt [✎] [×]
📄 bug72697.phpt [✎] [×]
📄 bug72709.phpt [✎] [×]
📄 bug72730.phpt [✎] [×]
📄 bug72913.phpt [✎] [×]
📄 bug72913.png [✎] [×]
📄 bug73155.phpt [✎] [×]
📄 bug73157.phpt [✎] [×]
📄 bug73159.phpt [✎] [×]
📄 bug73161.gd2 [✎] [×]
📄 bug73161.phpt [✎] [×]
📄 bug73213.phpt [✎] [×]
📄 bug73213.png [✎] [×]
📄 bug73272.phpt [✎] [×]
📄 bug73272.png [✎] [×]
📄 bug73279.phpt [✎] [×]
📄 bug73279_old.phpt [✎] [×]
📄 bug73281.phpt [✎] [×]
📄 bug73291.phpt [✎] [×]
📄 bug73549.phpt [✎] [×]
📄 bug73614.phpt [✎] [×]
📄 bug73614.png [✎] [×]
📄 bug73868.gd2 [✎] [×]
📄 bug73868.phpt [✎] [×]
📄 bug73869.phpt [✎] [×]
📄 bug73869a.gd2 [✎] [×]
📄 bug73869b.gd2 [✎] [×]
📄 bug73957.phpt [✎] [×]
📄 bug73968.phpt [✎] [×]
📄 bug73968.xbm [✎] [×]
📄 bug74031.phpt [✎] [×]
📄 bug74435.gif [✎] [×]
📄 bug74435.phpt [✎] [×]
📄 bug75111.phpt [✎] [×]
📄 bug75124.phpt [✎] [×]
📄 bug75124.png [✎] [×]
📄 bug75437.phpt [✎] [×]
📄 bug75571.gif [✎] [×]
📄 bug75571.phpt [✎] [×]
📄 bug76041.phpt [✎] [×]
📄 bug77195.jpg [✎] [×]
📄 bug77195.phpt [✎] [×]
📄 bug77198_auto.phpt [✎] [×]
📄 bug77198_threshold.phpt [✎] [×]
📄 bug77200.phpt [✎] [×]
📄 bug77269.phpt [✎] [×]
📄 bug77270.phpt [✎] [×]
📄 bug77272.phpt [✎] [×]
📄 bug77391.bmp [✎] [×]
📄 bug77391.phpt [✎] [×]
📄 bug77479.phpt [✎] [×]
📄 bug77700.phpt [✎] [×]
📄 bug77943.phpt [✎] [×]
📄 bug77943.png [✎] [×]
📄 bug77973.phpt [✎] [×]
📄 bug79067.phpt [✎] [×]
📄 bug79068.phpt [✎] [×]
📄 bug79068.png [✎] [×]
📄 bug79615.phpt [✎] [×]
📄 bug79676.phpt [✎] [×]
📄 colorat.phpt [✎] [×]
📄 colorclosest.phpt [✎] [×]
📄 colorexact.phpt [✎] [×]
📄 colormatch.phpt [✎] [×]
📄 colorresolve.phpt [✎] [×]
📄 conv_test.gif [✎] [×]
📄 conv_test.jpg [✎] [×]
📄 conv_test.png [✎] [×]
📄 conv_test.xbm [✎] [×]
📄 conv_test.xpm [✎] [×]
📄 conv_test私はガラスを食べられます.jpg [✎] [×]
📄 copy.phpt [✎] [×]
📄 copypalette.phpt [✎] [×]
📄 copyresized.phpt [✎] [×]
📄 crafted.gd2 [✎] [×]
📄 crafted_gd2.phpt [✎] [×]
📄 createfromgd2.phpt [✎] [×]
📄 createfromstring.phpt [✎] [×]
📄 createfromwbmp-mb.phpt [✎] [×]
📄 createfromwbmp.phpt [✎] [×]
📄 createfromwbmp2.phpt [✎] [×]
📄 createfromwbmp2_extern.phpt [✎] [×]
📄 dashedlines.phpt [✎] [×]
📄 func.inc [✎] [×]
📄 gd_info_basic.phpt [✎] [×]
📄 gd_info_variation1.phpt [✎] [×]
📄 gif.phpt [✎] [×]
📄 gif2gd.phpt [✎] [×]
📄 gif2jpg.phpt [✎] [×]
📄 gif2png.phpt [✎] [×]
📄 github_bug_215.phpt [✎] [×]
📄 image2wbmp_error.phpt [✎] [×]
📄 imageantialias_error1.phpt [✎] [×]
📄 imageantialias_error2.phpt [✎] [×]
📄 imagearc_basic.phpt [✎] [×]
📄 imagearc_basic.png [✎] [×]
📄 imagearc_error1.png [✎] [×]
📄 imagearc_variation1.phpt [✎] [×]
📄 imagearc_variation1.png [✎] [×]
📄 imagearc_variation2.phpt [✎] [×]
📄 imagearc_variation2.png [✎] [×]
📄 imagebmp_basic.phpt [✎] [×]
📄 imagebmp_nullbyte_injection.phpt [✎] [×]
📄 imagechar_basic.phpt [✎] [×]
📄 imagechar_basic.png [✎] [×]
📄 imagechar_error2.phpt [✎] [×]
📄 imagecharup_basic.phpt [✎] [×]
📄 imagecharup_basic.png [✎] [×]
📄 imagecharup_error2.phpt [✎] [×]
📄 imagecolorallocate_basic.phpt [✎] [×]
📄 imagecolorallocate_variation5.phpt [✎] [×]
📄 imagecolorallocate_variation6.phpt [✎] [×]
📄 imagecolorallocatealpha_basic.phpt [✎] [×]
📄 imagecolorallocatealpha_basic.png [✎] [×]
📄 imagecolorallocatealpha_error1.phpt [✎] [×]
📄 imagecolorclosesthwb_basic_001.phpt [✎] [×]
📄 imagecolordeallocate_basic.phpt [✎] [×]
📄 imagecolordeallocate_error1.phpt [✎] [×]
📄 imagecolordeallocate_error3.phpt [✎] [×]
📄 imagecolordeallocate_error4.phpt [✎] [×]
📄 imagecolormatch_basic.phpt [✎] [×]
📄 imagecolormatch_error2.phpt [✎] [×]
📄 imagecolormatch_error3.phpt [✎] [×]
📄 imagecolormatch_error4.phpt [✎] [×]
📄 imagecolorset_basic.phpt [✎] [×]
📄 imagecolorset_basic.png [✎] [×]
📄 imagecolorstotal_basic.phpt [✎] [×]
📄 imagecolorstotal_error.phpt [✎] [×]
📄 imagecolourstotal_basic.phpt [✎] [×]
📄 imageconvolution_basic.phpt [✎] [×]
📄 imageconvolution_basic.png [✎] [×]
📄 imageconvolution_error2.phpt [✎] [×]
📄 imageconvolution_error3.phpt [✎] [×]
📄 imagecopymerge_basic.phpt [✎] [×]
📄 imagecopymergegray_basic.phpt [✎] [×]
📄 imagecopyresampled_basic.phpt [✎] [×]
📄 imagecopyresampled_variation1.phpt [✎] [×]
📄 imagecreatefrombmp_basic.bmp [✎] [×]
📄 imagecreatefrombmp_basic.phpt [✎] [×]
📄 imagecreatefrombmp_basic.png [✎] [×]
📄 imagecreatefromstring.bmp [✎] [×]
📄 imagecreatefromstring.gif [✎] [×]
📄 imagecreatefromstring.webp [✎] [×]
📄 imagecreatefromstring_bmp.phpt [✎] [×]
📄 imagecreatefromstring_bmp.png [✎] [×]
📄 imagecreatefromstring_gif.phpt [✎] [×]
📄 imagecreatefromstring_png.phpt [✎] [×]
📄 imagecreatefromstring_webp.phpt [✎] [×]
📄 imagecreatefromtga.png [✎] [×]
📄 imagecreatefromtga_basic.phpt [✎] [×]
📄 imagecreatefromtga_basic.tga [✎] [×]
📄 imagecreatefromtga_variation.phpt [✎] [×]
📄 imagecreatefromtga_variation.tga [✎] [×]
📄 imagecreatetruecolor_basic.phpt [✎] [×]
📄 imagecreatetruecolor_basic.png [✎] [×]
📄 imagecreatetruecolor_error2.phpt [✎] [×]
📄 imagecrop_auto.phpt [✎] [×]
📄 imagedashedline_basic.phpt [✎] [×]
📄 imageellipse_basic.phpt [✎] [×]
📄 imageellipse_basic.png [✎] [×]
📄 imageellipse_error7.phpt [✎] [×]
📄 imagefill_1.phpt [✎] [×]
📄 imagefilledarc_basic.phpt [✎] [×]
📄 imagefilledarc_basic.png [✎] [×]
📄 imagefilledarc_error1.png [✎] [×]
📄 imagefilledarc_variation1.phpt [✎] [×]
📄 imagefilledarc_variation1.png [✎] [×]
📄 imagefilledarc_variation2.phpt [✎] [×]
📄 imagefilledarc_variation2.png [✎] [×]
📄 imagefilledellipse_basic.phpt [✎] [×]
📄 imagefilledellipse_basic.png [✎] [×]
📄 imagefilledpolygon_basic.phpt [✎] [×]
📄 imagefilledpolygon_negative.phpt [✎] [×]
📄 imagefilltoborder_basic.phpt [✎] [×]
📄 imagefilltoborder_basic.png [✎] [×]
📄 imagefilltoborder_error6.phpt [✎] [×]
📄 imagefilter.phpt [✎] [×]
📄 imagefilter_error1.phpt [✎] [×]
📄 imagefilter_error10.phpt [✎] [×]
📄 imagefilter_error11.phpt [✎] [×]
📄 imagefilter_error12.phpt [✎] [×]
📄 imagefilter_error13.phpt [✎] [×]
📄 imagefilter_error15.phpt [✎] [×]
📄 imagefilter_error17.phpt [✎] [×]
📄 imagefilter_error18.phpt [✎] [×]
📄 imagefilter_error20.phpt [✎] [×]
📄 imagefilter_error4.phpt [✎] [×]
📄 imagefilter_error6.phpt [✎] [×]
📄 imagefilter_error7.phpt [✎] [×]
📄 imagefilter_error8.phpt [✎] [×]
📄 imagefilter_error9.phpt [✎] [×]
📄 imageflip.phpt [✎] [×]
📄 imagefontheight_basic.phpt [✎] [×]
📄 imagefontwidth_basic.phpt [✎] [×]
📄 imagefttext.phpt [✎] [×]
📄 imagegammacorrect_basic.phpt [✎] [×]
📄 imagegammacorrect_basic.png [✎] [×]
📄 imagegammacorrect_error2.phpt [✎] [×]
📄 imagegammacorrect_variation1.phpt [✎] [×]
📄 imagegammacorrect_variation1.png [✎] [×]
📄 imagegammacorrect_variation2.phpt [✎] [×]
📄 imagegammacorrect_variation2_1_1.png [✎] [×]
📄 imagegammacorrect_variation2_1_2.png [✎] [×]
📄 imagegammacorrect_variation2_2_1.png [✎] [×]
📄 imagegd2_nullbyte_injection.phpt [✎] [×]
📄 imagegd_nullbyte_injection.phpt [✎] [×]
📄 imagegd_truecolor.phpt [✎] [×]
📄 imagegd_truecolor.png [✎] [×]
📄 imagegetclip_basic.phpt [✎] [×]
📄 imagegif_nullbyte_injection.phpt [✎] [×]
📄 imageinterlace_basic.phpt [✎] [×]
📄 imageinterlace_error2.phpt [✎] [×]
📄 imageinterlace_variation1.phpt [✎] [×]
📄 imageinterlace_variation2.phpt [✎] [×]
📄 imageistruecolor_basic.phpt [✎] [×]
📄 imageistruecolor_error1.phpt [✎] [×]
📄 imagejpeg_nullbyte_injection.phpt [✎] [×]
📄 imagelayereffect_basic.phpt [✎] [×]
📄 imagelayereffect_basic.png [✎] [×]
📄 imagelayereffect_error3.phpt [✎] [×]
📄 imageloadfont_end_of_file_while_reading_header.phpt [✎] [×]
📄 imageloadfont_error2.phpt [✎] [×]
📄 imageloadfont_invalid.phpt [✎] [×]
📄 imageopenpolygon.png [✎] [×]
📄 imageopenpolygon_basic.phpt [✎] [×]
📄 imagepalettetotruecolor_basic.phpt [✎] [×]
📄 imagepalettetotruecolor_error3.phpt [✎] [×]
📄 imagepng_nullbyte_injection.phpt [✎] [×]
📄 imagepolygon_aa.phpt [✎] [×]
📄 imagepolygon_aa.png [✎] [×]
📄 imagepolygon_basic.phpt [✎] [×]
📄 imagepolygon_negative.phpt [✎] [×]
📄 imagerectangle_basic.phpt [✎] [×]
📄 imagerectangle_basic.png [✎] [×]
📄 imagerectangle_error2.phpt [✎] [×]
📄 imageresolution_jpeg.phpt [✎] [×]
📄 imageresolution_png.phpt [✎] [×]
📄 imagerotate_overflow.phpt [✎] [×]
📄 imagescale_preserve_ratio.phpt [✎] [×]
📄 imagesetbrush_basic.phpt [✎] [×]
📄 imagesetbrush_basic.png [✎] [×]
📄 imagesetclip_basic.phpt [✎] [×]
📄 imagesetthickness_basic.phpt [✎] [×]
📄 imagesetthickness_basic.png [✎] [×]
📄 imagesetthickness_error1.phpt [✎] [×]
📄 imagestring_basic.phpt [✎] [×]
📄 imagestring_basic.png [✎] [×]
📄 imagestring_error2.phpt [✎] [×]
📄 imagestringup_basic.phpt [✎] [×]
📄 imagestringup_basic.png [✎] [×]
📄 imagestringup_error2.phpt [✎] [×]
📄 imagetruecolortopalette_basic.phpt [✎] [×]
📄 imagetruecolortopalette_basic.png [✎] [×]
📄 imagetruecolortopalette_error1.phpt [✎] [×]
📄 imagetruecolortopalette_error3.phpt [✎] [×]
📄 imagetruecolortopalette_error4.phpt [✎] [×]
📄 imagettftext_charmap_order.phpt [✎] [×]
📄 imagetypes_bmp.phpt [✎] [×]
📄 imagetypes_tga.phpt [✎] [×]
📄 imagewbmp-mb.phpt [✎] [×]
📄 imagewbmp.phpt [✎] [×]
📄 imagewbmp_nullbyte_injection.phpt [✎] [×]
📄 imagewebp_nullbyte_injection.phpt [✎] [×]
📄 imagexbm_nullbyte_injection.phpt [✎] [×]
📄 invalid_neg_size.gd2 [✎] [×]
📄 invalid_neg_size私はガラスを食べられます.gd2 [✎] [×]
📄 jpeg2png.phpt [✎] [×]
📄 jpeg2wbmp_error1.phpt [✎] [×]
📄 jpeg2wbmp_error2-mb.phpt [✎] [×]
📄 jpeg2wbmp_error2.phpt [✎] [×]
📄 jpeg2wbmp_error3.phpt [✎] [×]
📄 jpg2gd-mb.phpt [✎] [×]
📄 jpg2gd.phpt [✎] [×]
📄 libgd00086.phpt [✎] [×]
📄 libgd00086.png [✎] [×]
📄 libgd00086_extern.phpt [✎] [×]
📄 libgd00094-mb.phpt [✎] [×]
📄 libgd00094.phpt [✎] [×]
📄 libgd00094.xbm [✎] [×]
📄 libgd00094私はガラスを食べられます.xbm [✎] [×]
📄 libgd00100.phpt [✎] [×]
📄 libgd00100.png [✎] [×]
📄 libgd00101.gd [✎] [×]
📄 libgd00101.phpt [✎] [×]
📄 libgd00106.phpt [✎] [×]
📄 libgd00186.phpt [✎] [×]
📄 libgd00191.phpt [✎] [×]
📄 lines.phpt [✎] [×]
📄 logo_noise.png [✎] [×]
📄 php.gif [✎] [×]
📄 png2gd.phpt [✎] [×]
📄 png2wbmp_error1-mb.phpt [✎] [×]
📄 png2wbmp_error1.phpt [✎] [×]
📄 png2wbmp_error2.phpt [✎] [×]
📄 png2wbmp_error3.phpt [✎] [×]
📄 pngcomp.phpt [✎] [×]
📄 similarity.inc [✎] [×]
📄 src.gd2 [✎] [×]
📄 src.wbmp [✎] [×]
📄 src私はガラスを食べられます.wbmp [✎] [×]
📄 test.png [✎] [×]
📄 test8859.ttf [✎] [×]
📄 test_image_equals_file_palette.phpt [✎] [×]
📄 types.phpt [✎] [×]
📄 webp_basic.phpt [✎] [×]
📄 xbm2png.phpt [✎] [×]
📄 xpm2gd.phpt [✎] [×]
📄 xpm2jpg.phpt [✎] [×]
📄 xpm2png.phpt [✎] [×]