apng: Convert static pngs to animated png

In apng: Convert Png Files into Animated Png

Description

Combine multiple png files into an animated png file.

Usage

apng(input_files = c(), output_file = "output.png",
num_plays = 0, delay_num = 0, delay_den = 0,
dispose_op = APNG_DISPOSE_OP_NONE,
blend_op = APNG_BLEND_OP_SOURCE)

Arguments

input_files	to specify the names of the input files
output_file	the name of the output file
num_plays	the amount of times to repeat the animation (0 means forever)
delay_num	the numerator of the frame delay (delay = delay_num / delay_den)
delay_den	the denominator of the frame delay (delay = delay_num / delay_den)
dispose_op	the frame disposal strategy (APNG_DISPOSE_OP_NONE, APNG_DISPOSE_OP_BACKGROUND, APNG_DISPOSE_OP_PREVIOUS)
blend_op	the frame blending strategy (APNG_BLEND_OP_SOURCE, APNG_BLEND_OP_OVER)

For more information on blending and frame disposal strategies see https://wiki.mozilla.org/APNG_Specification.

Value

Returns nothing, output is written to output_file.

Examples

input1 <- tempfile(pattern = "", fileext = ".png")
input2 <- tempfile(pattern = "", fileext = ".png")
output <- tempfile(pattern = "", fileext = ".png")

# Generate inputs.
png(filename=input1)
plot(1:40, (1:40)^2)
dev.off()
png(filename=input2)
plot(1:40, (-1*1:40)^3)
dev.off()

# Create an animated png.
apng(c(input1, input2), output)

Example output

Loading required package: bitops
png 
  2 
png 
  2 
Warning messages:
1: In READ_PNG(file_input) :
  PNG CONTAINS A PALETTE, PALETTE-LESS PNG (ex. png(type="cairo-png")) IS VERY MUCH SUGGESTED
2: In READ_PNG(file_input) :
  PNG CONTAINS A PALETTE, PALETTE-LESS PNG (ex. png(type="cairo-png")) IS VERY MUCH SUGGESTED

apng documentation built on Jan. 16, 2021, 5:40 p.m.