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.