Problems with PNG where the background is transparent

[ongkarakkomol]

I tried using Image(), which works fine for both JPG and PNG, but there was a problem only with PNG that have transparent backgrounds. It will show strange pictures.

filesource :

in PDF :

[gamalielmendez]

While it is true that in the last update a flaw was introduced in loading PNG images, this is not related to the error you are encountering when trying to load your image, since I performed tests with the example you provide and from what I see, this image is 16 bits. At the moment, node-fpdf only supports 8-bit PNGs. In fact, I do not understand how you manage to pass this validation:

    const bpc = imageReader.readint8() //ord(imageReader.readEncodeData(1));
    if (bpc > 8) {
        throw '16-bit depth not supported: ' + file
    }

In fact, you shouldn't be able to generate the PDF.
Please ensure that the image you are using to generate the PDF is the same as the one you are providing as an example. If it is not, please share the correct image.

[ongkarakkomol]

Thanks @gamalielmendez I use library Sharp to convert PNG to 8 before using.

sharp(data, { raw: { width, height, channels } }) .toFormat('png', { quality: 100, depth: 8 }) .toFile(signature_path);