# Image

- add_caption [edit] v0.1
*Add a centered caption to the bottom of an image.* - add_transparency [edit] v0.2
*Make an image partially transparent.* - allocate_color [edit] v0.2
*Helper function to allocate a color to an image. Color should be a 6-character hex string.* - blur_image [edit] v0.1
*Blur an image.* - constrain_image [edit] v0.4
*Force an image to be a certain size by cropping, scaling or adding borders.* - convert2grayscale [edit] v0.2
*Convert an image to grayscale.* - create_gradient [edit] v0.1
*Create an image that is a color gradient.* - draw_mandelbrot [edit] v0.1
*Draw the Mandelbrot set fractal. See http://en.wikipedia.org/wiki/Mandelbrot_set* - draw_quick_sphere [edit] v0.3
*Draw an approximation of a sphere with a single light source. This algorithm merely draws a series of ellipses to approximate the shading in the sphere.* - draw_sierpinski [edit] v0.5
*Draw a Sierpinski fractal triangle.* - draw_triangle [edit] v0.4
*Draw a filled triangle.* - draw_upc_barcode [edit] v0.3
*Draw a barcode for a UPC number.* - duotone_image [edit] v0.5
*Change an image into a tinted grayscale.* - edgify [edit] v0.1
*Highlight the edges on an image using the Sobel Technique.* - equilateral_shape [edit] v0.2
*Draw a shape that has a number of equal-length sides.* - flip_image [edit] v0.1
*Flip an image along an axis.* - frame_picture [edit] v0.1
*Put a nice border around a picture. The color of the border will be the average color of the picture.* - get_average_color [edit] v0.2
*Calculate the average color of an image.* - image_callback [edit] v0.1
*Use a callback to perform successive operations on an image.* - image_create_alpha [edit] v0.1
*Helper function to create a new blank image with transparency.*