painting: Image Painting

In magick: Advanced Graphics and Image-Processing in R

Image Painting

Description

The image_fill() function performs flood-fill by painting starting point and all neighboring pixels of approximately the same color. Annotate prints some text on the image.

Usage

image_fill(image, color, point = "+1+1", fuzz = 0, refcolor = NULL)

image_annotate(
  image,
  text,
  gravity = "northwest",
  location = "+0+0",
  degrees = 0,
  size = 10,
  font = "",
  style = "normal",
  weight = 400,
  kerning = 0,
  decoration = NULL,
  color = NULL,
  strokecolor = NULL,
  strokewidth = NULL,
  boxcolor = NULL
)

Arguments

image	magick image object returned by image_read() or image_graph()
color	a valid color string such as "navyblue" or "#000080". Use "none" for transparency.
point	a geometry_point string indicating the starting point of the flood-fill
fuzz	relative color distance (value between 0 and 100) to be considered similar in the filling algorithm
refcolor	if set, fuzz color distance will be measured against this color, not the color of the starting point. Any color (within fuzz color distance of the given refcolor), connected to starting point will be replaced with the color. If the pixel at the starting point does not itself match the given refcolor (according to fuzz) then no action will be taken.
text	character vector of length equal to 'image' or length 1
gravity	string with gravity value from gravity_types.
location	geometry string with location relative to gravity
degrees	rotates text around center point
size	font-size in pixels
font	string with font family such as "sans", "mono", "serif", "Times", "Helvetica", "Trebuchet", "Georgia", "Palatino" or "Comic Sans". See magick_fonts() for what is available.
style	value of style_types for example "italic"
weight	thickness of the font, 400 is normal and 700 is bold, see magick_fonts().
kerning	increases or decreases whitespace between letters
decoration	value of decoration_types for example "underline"
strokecolor	a color string adds a stroke (border around the text)
strokewidth	set the strokewidth of the border around the text
boxcolor	a color string for background color that annotation text is rendered on.

Details

Note that more sophisticated drawing mechanisms are available via the graphics device using image_draw.

Setting a font, weight, style only works if your imagemagick is compiled with fontconfig support.

See Also

Other image: _index_, analysis, animation, attributes(), color, composite, defines, device, edges, editing, effects(), fx, geometry, morphology, ocr, options(), segmentation, transform(), video

Examples

logo <- image_read("logo:")
logo <- image_background(logo, 'white')
image_fill(logo, "pink", point = "+450+400")
image_fill(logo, "pink", point = "+450+400", fuzz = 25)
# Add some text to an image
image_annotate(logo, "This is a test")
image_annotate(logo, "CONFIDENTIAL", size = 50, color = "red", boxcolor = "pink",
 degrees = 30, location = "+100+100")

# Setting fonts requires fontconfig support (and that you have the font)
image_annotate(logo, "The quick brown fox", font = "monospace", size = 50)

magick documentation built on Sept. 30, 2024, 9:39 a.m.