# image/png Return a copy of the image with its output format set to PNG. Encoding with `image/bytes` / `image/write` then emits PNG (lossless). ## Syntax

[image/png $img ?opts]

## Parameters - `$img` — an `Image` value - `$opts` — optional map; `:compression-level` 0–9 (default 6, higher is smaller). Out-of-range values are clamped, not errors. ## Examples

set img [image/open "test/fixtures/images/test.jpg"]
set out [image/png $img %{ compression-level 9 }]
[image/format [image/decode [image/bytes $out]]]   # → "png"

## Returns A new `Image` with the same pixels and dimensions but PNG as its output format. `nil` when the argument is not a live `Image`. ## See Also `image/encode`, `image/bytes`, `image/write`, `image/base64`