Transparent Gradient does not export to PDF correctly #2546
Description
Description
When applying a gradient with alpha, the PDF export puts a white background behind the gradient.
Preview on webapp behaves as expected
PNG export behaves as expected.
PDF export does not match preview nor PNG, it places a white background behind the gradient.
// nested rectangles
#rect(fill: rgb(50%, 50%, 0%))[
#rect(fill: rgb(50%, 0%, 0%))[#h(100%)]
]
// transparent rectangles
#rect(fill: rgb(50%, 50%, 0%, 120))[
#rect(fill: rgb(50%, 0%, 0%, 120))[#h(100%)]
]
// gradient has white background in PDF export
#let transparent = rgb(255, 255, 255, 0)
#rect(fill: rgb(50%, 50%, 0%, 100))[
#rect(fill: gradient.linear(transparent, transparent, rgb(50%, 0%, 0%), transparent, transparent))[#h(100%)]
]
// for completeness, a color with a specified alpha value also fails
#rect(fill: rgb(50%, 50%, 0%, 100))[
#rect(fill: gradient.linear(transparent, transparent, rgb(50%, 0%, 0%, 120), transparent, transparent))[#h(100%)]
]I am not 100% familiar with how a PDF document works, but somewhere in the chain, I suspect that the gradient's transparency information is lost.
Reproduction URL
No response
Operating system
Web app
Typst version
- I am using the latest version of Typst