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Image opacity option not working

See original GitHub issue

I tried to use the opacity option with an image and is not working, if you open the file image in node_modules, you can see option.opacity declared but never used, but the documentation says you can use that property, in resume: it’s not working

pdf.image(path + fileName, 361, 326, { width: 600, height: 450, keepAspectRatio: true, opacity: 10, align: 'center center' });

Issue Analytics

State:
Created 4 years ago
Comments:6 (4 by maintainers)

Top GitHub Comments

1reaction

chunyenHuangcommented, Mar 7, 2020

The new version should fix this issue for you.

1reaction

chunyenHuangcommented, Mar 7, 2020

Oh I see the where the issue is.

          page1header.image(logos.path + logos.files.partner, 700, 32, {
              width: 100,
              height: 30,
              keepAspectRatio: true,
              align: 'center center'
          });
          // water mark
          page1header.image(logos.path + logos.files.partner, 361, 326, { // center: 371, 306,
              width: 600,
              height: 450,
              keepAspectRatio: true,
              opacity: 0.3,
              align: 'center center'
          });

You called .image twice with different opacity setups. It is a bug that the xObject is cached so the opacity is locked to the first image.

I can reproduce this bug with the following codes

const path = require('path');
const HummusRecipe = require('../lib');

describe('Modify', () => {
    const taskATP = 'Add transparent png';
    it(taskATP, (done) => {
        const src = path.join(__dirname, 'materials/test.pdf');
        const output = path.join(__dirname, `output/${taskATP}.pdf`);
        const wikiPng = path.join(__dirname, 'materials/wiki.png');

        const recipe = new HummusRecipe(src, output);
        recipe
            .editPage(1)
            .image(wikiPng, 'center', 50, {
                width: 300,
                height: 300,
                align: 'center center',
                opacity: 0.8,
            })
            .image(wikiPng, 'center', 'center', {
                width: 300,
                height: 300,
                align: 'center center',
                opacity: 0.1,
            })
            .endPage()
            .endPDF(done);
    });
});