使用reportlab将图像放入pdf时提高图像的质量

Question

I'm trying to put an JPG image into a PDF using reportlab like follow, in python language.

p = canvas.Canvas(buffer) p.drawImage(filename_jpg_image,x,y)

The problem here is that the image displayed in the pdf does not have the same quality as the original one. I want to know if there are a way to specify the quality in this context, or improve it anyway. Anybody can help me?

Answer 1

Unfortunately, most tools that put JPEGs into PDFs will uncompress and then (badly) recompress the JPEG.

img2pdf can wrap many (most?) JPEG images into PDFs without changing the compression (without decompressing at all, in fact).

Then you can use pdfrw to pull that PDF onto the reportlab canvas as a form xObject (similar to an image). There are a few examples in the pdfrw/examples/rl1 directory that show how to do this.

Disclaimer: I am the pdfrw author.