如何在Python 3中将Turtle画布另存为图像(.png或.jpg) [英] How can I save a Turtle canvas as an image (.png or .jpg) in Python 3

问题描述

我一直在使用turtle模块，并希望以此为起点来开发可以识别数字/字母的简单图像识别程序.我需要能够将乌龟另存为可以操纵的图像，例如重新缩放，旋转等，以尝试调整图像.我已经研究了几个小时，似乎找不到任何有效的方法.我发现了如何将Turtle输出另存为Tkinter画布:

I've been working with the turtle module and want to use it as a starting point to work on a simple image recognition program that could recognize numbers/letters. I need to be able to save the turtle as an image I could manipulate- recaling, rotating, etc. to try to regulate the images. I've been researching for hours and cannot seem to find anything that works. I have discovered how to save the Turtle output as a Tkinter canvas:

import turtle
t = turtle.Turtle()
# Draw something
canvas = t.getscreen().getcanvas()  # Saves a Tkinter canvas object

这似乎很棒.下一步是将其另存为.png或.jpg.但是，我唯一能找到的就是如何将其另存为Postscript文件:

This seems to work great. The next step is to save that as a .png or .jpg. However, the only thing I can find is how to save it as a postscript file:

canvas.postscript(file="turtle_img.ps")  # Saves as a .ps file

从那里，我尝试使用PIL将.ps文件转换为.png或.jpeg文件.这是我的代码以及出现的错误:

From there, I have attempted to convert the .ps file into a .png or .jpeg file using PIL. Here is my code for that and the error that I get:

from PIL import Image
turtle_img = Image.open("turtle_img.ps")
turtle_img.save("turtle_img", "png")
# Also tried:   turtle_img.save("turtle_img, "jpeg")

运行"turtle_img.save("turtle_img"，"png")行会产生:

Running the line "turtle_img.save("turtle_img", "png") produces:

OSError: Unable to locate Ghostscript on paths

我会喜欢以下之一: 1.一种将.ps转换为.jpeg，.png甚至位图的方法 2.另一种保存Tkinter画布的方法，更易于使用

I would love one of the following: 1. a way to convert a .ps into a .jpeg, .png, or even a bitmap 2. An alternate way of saving a Tkinter canvas that is easier to work with

我想澄清一下，我将使用大量此类文件，并且希望在脚本中自动执行该过程，而不是对每个图像使用命令行.

I wanted to clarify that I would be working with a large number of these and would like to automate the process in a script rather than use the command line for each image.

所有答案将不胜感激！预先谢谢你.

All answers will be appreciated! Thankyou in advance.

推荐答案

您可以使用Ghostscript将PostScript程序呈现为位图.例如:

You can use Ghostscript to render a PostScript program to a bitmap. For example:

gs -sDEVICE=png16m -o out.png input.ps

还有其他可用的文件格式和颜色深度，例如png256，jpeg等.如果是多页输入文件，则:

There are other file formats and colour depths available, such as png256, jpeg etc. If its a multi-page input file then:

gs -sDEVICE=png16m -o out%d.png input.ps

这篇关于如何在Python 3中将Turtle画布另存为图像(.png或.jpg)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！