# [−][src]Type Definition image::GrayImage

    type GrayImage = ImageBuffer<Luma<u8>, Vec<u8>>;

Sendable grayscale image buffer

## Methods

### `impl GrayImage`[src]

#### `pub fn expand_palette(
self,
palette: &[(u8, u8, u8)],
transparent_idx: Option<u8>
) -> RgbaImage`[src]

Expands a color palette by re-using the existing buffer. Assumes 8 bit per pixel. Uses an optionally transparent index to adjust it's alpha value accordingly.

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g., `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g., `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g., `str,u8` or `String,struct:Vec,test`)