geom
Displays image specified by RasterData.
This geom is not as flexible as geomRaster() or geomTile() but vastly superior in the terms of rendering efficiency.
Notes
-----This geom doesn't understand any aesthetics. It doesn't support color scales either.
Examples
Return
Layer object.
Parameters
Specifies image type, size and pixel values. See RasterData.create.
default = true.
true - luminance values in grey-scale image will be scaled to
[0-255]range using a linear scaler.false - disables scaling of luminance values in grey-scale image. This parameter is ignored for RGB(A) images.
default = null. Defines the data range used for luminance normalization in grey-scale images. This parameter is ignored for RGB(A) images or if parameter norm = false.
default = null. Defines the data range used for luminance normalization in grey-scale images. This parameter is ignored for RGB(A) images or if parameter norm = false.
default = listOf(-0.5, ncol-0.5, -0.5, nrow-0.5). List of 4 numbers: (left, right, bottom, top). Defines image's bounding box in terms of the "data coordinates".
left, right: coordinates of pixels outer edge along the x-axis for pixels in the 1-st and the last column.bottom, top: coordinates of pixels outer edge along the y-axis for pixels in the 1-st and the last row.
default = true. Greyscale images only. false - do not show legend for this layer.
default="paint_c" ("fill", "color", "paint_a", "paint_b", "paint_c"). Define the color-aesthetic used by the legend shown for a greyscale image.