This code allows you to save all the unique colors from the document as a csv file with hex codes:
const DE_CIE76 = 0; //color difference: 0-255
const THRESHOLD = 0; //color pixels threshold
var s2t = stringIDToTypeID,
t2s = typeIDToStringID,
colorsObj = {},
colorsArr = [];
(r = new ActionReference()).putProperty(s2t('property'), p = s2t('mode'));
r.putEnumerated(s2t('document'), s2t('ordinal'), s2t('targetEnum'));
if (t2s(executeActionGet(r).getEnumerationValue(p)) == 'RGBColor') {
var f = new File(Folder.temp + '/colors.raw');
(d = new ActionDescriptor()).putBoolean(s2t("channelsInterleaved"), true);
d.putBoolean(s2t('copy'), true);
(d1 = new ActionDescriptor()).putObject(s2t("as"), s2t("rawFormat"), d);
d1.putPath(s2t("in"), f);
executeAction(s2t("save"), d1, DialogModes.NO);
f.open('r');
f.encoding = "BINARY";
doForcedProgress('Reading colors', 'readColors(f.read(), colorsObj)');
f.close();
f.remove();
for (var a in colorsObj) if (colorsObj[a] > THRESHOLD) colorsArr.push({ pixels: colorsObj[a], hex: a });
if (DE_CIE76) doForcedProgress('Filtering colors by dE = ' + DE_CIE76, 'filterByDE(colorsArr)');
var f = File(Folder.desktop.fsName + "/" + activeDocument.name.replace(/\.[0-9a-z]+$/i, '') + '.csv');
f = f.saveDlg('Save file', '*.csv,*.htm');
if (f) {
if (f.open('w')) {
if (f.fsName.match(/\.[0-9a-z]+$/i)[0] == '.csv') {
f.writeln('HEX;PixelCount')
for (var i = 0; i < colorsArr.length; i++) {
if (!colorsArr[i]) continue;
f.writeln('#' + colorsArr[i].hex + ';' + colorsArr[i].pixels)
}
} else {
f.write('<table>\n<tbody>\n<tr>\n<th>HEX</th>\n<th>Color</th>\n<th>Pixel count</th>\n</tr>')
for (var i = 0; i < colorsArr.length; i++) {
if (!colorsArr[i]) continue;
f.writeln('<tr>\n<td>#' + colorsArr[i].hex + '</td>\n<td style="background-color: #' + colorsArr[i].hex + ';"></td>\n<td>' + colorsArr[i].pixels + '</td>\n</tr>')
}
f.write('</tbody>\n</table>')
}
f.close()
} else { alert(decodeURI(f) + '\nFile access error') }
}
}
function readColors(s, colorsObj) {
for (var i = 0; i < s.length; i += 3) {
var cur = toHex(s, i, 3)
updateProgress(i, s.length)
if (colorsObj[cur]) colorsObj[cur]++; else colorsObj[cur] = 1;
}
}
function filterByDE(c) {
for (var i = 0; i < c.length; i++) {
updateProgress(i, c.length)
if (c[i] == null) continue;
var cA = new SolidColor;
cA.rgb.hexValue = c[i].hex;
for (var x = i + 1; x < c.length; x++) {
if (c[x] == null || c[i] == null) continue;
var cB = new SolidColor;
cB.rgb.hexValue = c[x].hex;
if (deltaE(cA, cB) <= 10) {
if (c[i].pixels > c[x].pixels) {
c[i].pixels += c[x].pixels
c[x] = null
} else {
c[x].pixels += c[i].pixels
c[i] = null
}
}
}
}
}
function toHex(s, from, bits) {
var h = '';
for (var i = from; i < from + bits; i++) h += (('0' + s.charCodeAt(i).toString(16)).slice(-2));
return h
}
function deltaE(a, b) {
return Math.sqrt(Math.pow(b.lab.l - a.lab.l, 2) + Math.pow(b.lab.a - a.lab.a, 2) + Math.pow(b.lab.b - a.lab.b, 2))
}
UPD:
I have updated the code. Added the ability to filter by the degree of color difference (using the delta E CIE76 formula) to filter out very close shades*, as well as the ability to set a threshold by the number of pixels so that it is possible to exclude random values (it may be necessary if the files are stored in jpg or fills with dithering are used), added optional .csv and .htm report
Zero values for each of the constants means that this filter does not work.
const DE_CIE76 = 0; //color difference: 0-255
const THRESHOLD = 0; //color pixels threshold
* note that color difference analysis is quite resource intensive, so filtering by degree of color difference can take a long time on images with many different shades.
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