有没有办法用R转换图像?以JPEG到GIF为例 [英] Is there a way to convert image with R ? JPEG to GIF for example
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问题描述
我希望使用R在tcltk窗口中显示图像(不在R设备中),但是最简单的方法(如下所示)仅支持GIF文件:
I wish to display images in a tcltk window (not in a R device) using R but the simpliest method (below) supports only GIF files :
require(tcltk)
tcl("image","create","photo", "imageID", file="a.gif")
w <- tktoplevel()
l <- ttklabel(w, image="imageID", compound="image")
tkpack(l)
我的文件是png/jpeg(包含我程序本身生成的直方图的文件)
and I my files are png/jpeg (file containing histograms generated by my program itself)
有人有想法进行转换吗?
someone has an idea to do that conversion ?
谢谢
推荐答案
尽管警告似乎成功了:
png("test.png")
plot(1,1)
dev.off()
#quartz
# 2
library(png)
help(package="png")
img <- readPNG("test.png")
str(img)
# num [1:480, 1:480, 1:4] 1 1 1 1 1 1 1 1 1 1 ...
require(caTools)
#Loading required package: caTools
write.gif(img, "test.gif", scale="always")
#-----------------
Warning message:
In if (col == "jet") col = colorRampPalette(c("#00007F", "blue", :
the condition has length > 1 and only the first element will be used
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