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Showing content from http://libvips.github.io/libvips/API/current/method.Image.pngsave_target.html below:

Vips.Image.pngsave_target

int
vips_pngsave_target (
  VipsImage* in,
  VipsTarget* target,
  ...
)

As vips_pngsave(), but save to a target.

Optional arguments

• compression: gint, compression level
• interlace: gboolean, interlace image
• filter: VipsForeignPngFilter, row filter flag(s)
• palette: gboolean, enable quantisation to 8bpp palette
• Q: gint, quality for 8bpp quantisation
• dither: gdouble, amount of dithering for 8bpp quantization
• bitdepth: gint, set write bit depth to 1, 2, 4, 8 or 16
• effort: gint, quantisation CPU effort

This method is not directly available to language bindings.

target

Type: VipsTarget

Save image to this target.

The data is owned by the caller of the method.

...

Type: 

NULL-terminated list of optional named arguments.

Type: int

0 on success, -1 on error.

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