resize_to_standard {plothelper}

Resize an Image According to the Other Image or to Ratios

Description

Simple wrapper of magick::image_resize. See the parameters below.

Usage

resize_to_standard(x, standard = 0.5, what = "all", scale = TRUE)

Arguments

x

the image you want to resize.

standard

either the image whose size is the standard or two ratios. When it specifies two ratios, it should be a numeric vector whose first and second elements are multipliers for width and height. For example, x's width and height are 100 and 60, and standard = c(0.5, 3), then the result image's width and height will be 50 and 180. If one of the two number is NA, then the dimension represented by this NA will be modified automatically.

what

this parameter is used only when standard is an image. It specifies the way to resize. When it is "width", let x's width be the same as standard; whether its height is automatically scaled depends on scale. When it is "height", let x's height be the same as standard; whether its width is automatically scaled depends on scale. When it is "all" (or "both"), the default, let x's width and height be the same as standard. When it is two number linked with a "_", it means resizing a according to b's width and height multiplied. For example, if it is "3_2" and b's width and height are 50, 70, then the result's width and height are 50 * 3 = 150, 70 * 2 = 140. Forms like "_2" or "3_" are also accepted.

scale

Default is TRUE. It is only used when only one of width and height is to be modified. This parameter decides whether the image is automatically scaled.