contrast.img: Change image contrast

In ckenaley/trackter: Automated Kinematic Analysis of Image Data

Description

Changes the contrast of an image or images

Usage

contrast.img(img = NULL, c = 2, out.dir = NULL, type = NULL)

Arguments

img	character, a path to an image file or directory containing images.
c	numeric, the factor by which to change the contrast. 'c'>1 enhances, 'c'<1 reduces.
out.dir	character, the directory to which the image will be saved.
type	character, image type (optional). Must be: "jpeg", "png", or "tiff (case ignored)." If missing, file format is automatically determined by file name extension(s).

Examples

#retrieve image in system
 y <-system.file("extdata/img", "sunfish_BCF.jpg", package = "trackter")
od <- paste0(tempdir(),"/cropimg")
dir.create(od)

#display original
EBImage::display(EBImage::readImage(y),method="raster")


# adjust contrast and save as original format
contrast.img(img=y,c=0.5,out.dir=od)

#display modified image
EBImage::display(EBImage::readImage(paste0(od,"/sunfish_BCF.jpg")),method="raster")

#clean up
unlink(od,recursive=TRUE)

ckenaley/trackter documentation built on Feb. 11, 2022, 6:43 a.m.