tag 标签: Image

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  • 热度 9
    2019-5-15 22:59
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    Python 学习了一段时间的基础语法,的确感觉其语法的自由度很高,入门容易,但是并不友好。《 Python 编程从入门到实践》后半部分开始讲 pygame 来制作游戏,所描述的安装方式非常的简单:下载 pygame ;然后在 cmd 下输入命令: pip install pygame ,安装完成。 我懵逼了。 What?Pygame什么玩意?哪里下载?于是我搜索了一下,找到了pygame的官网 http://www.pygame.org/download.shtml ,里面最新的是这个: 但是下载下来以后,怎么敲命令都不行,折腾一个下午都没安装上去,总是错误,我都开始怀疑智商了,差一点就放弃了。找了很多安装文件之类的,都无法加载。到了晚上终于找到了 http://www.lfd.uci.edu/~gohlke/pythonlibs/#pygame 这个地址,里面才找到合用的 pygame 安装文件。 用最后一个文件装好 pygame 以后,简单试验了一下书中的历程,然后兴致勃勃又去安装 Image 。这个要先安装 PIL ?!又是搜索不到,最终还是在这个网址下面找到了 Pillow 看第一句话才知道, Python 2 下面用的是 PIL ,但是不支持 Python 3 ,我用的是 Python 3.7 ,所以要用 Pillow 。 Python 的库实在是太混乱了,我已经晕了,不光说 2.x 和 3.x 不兼容、 win32 和 win amd64 不兼容我能理解以外, 3.6 、 3.7 都不兼容是什么鬼?下载 3.6 版本的 Pillow 就是装不上,也不说为什么。如果我们用 VS ,肯定会向下兼容,如果安装的库不合适,会自动提示,也会有官方的下载地址,甚至可以自动升级。而目前我所看到的 python ,仍然是一头雾水,安装错误一点提示都没有,完全需要运气去搜索猜测。到底能不能给我这样年纪大了的爱好者一条活路?! 为什么别人家安装是这样的吨吨吨下载安装完成: 而我是需要自己搜索、下载,自己敲命令自己判断是否安装成功?!怎么会这么复杂? 真是费了大功夫才把 Image 的库安装成功,并且写了一个简单的图像处理程序: from PIL import Image pil_im = Image.open("1.jpg") im2 = pil_im # 备份原始图像 w,h = pil_im.size # 获取图像尺寸 pil_im = pil_im.resize((w+w,h)) # 将图像尺寸横向拉长 box = (0, 0, w,h) re = im2.crop(box) pil_im.paste(re,box) # 将原始图像放在左侧 box = (w, 0, w+w,h) re = re.convert("L") pil_im.paste(re,box) # 将灰度图像放在右侧 pil_im.show() 输出的结果就是原始图像和灰度图像的对比,如下图,其实除了妹子很清纯以外,程序并不咋地: 而我十年前用 BCB 写的灰度图像转换用了多少行?如下,光一个灰度的函数就已经十几行了,还没算前面框架搭建,文件读取等函数,而在 Python 里面只用 2 行就可以实现,而且速度也快了不少,优势的确很明显。 void __fastcall TForm1::GrayTranClick(TObject *Sender) { Bitmap); int red,green,blue; int gray; GetRgbp(Sender); for(i = 1;i < x-1;i++) { for(j = 1;j < y-1;j++) { red = rgbp .r; green = rgbp .g; blue = rgbp .b; gray = red/3+green/3+blue/3; Pixels = RGB(gray,gray,gray); } } Assign(Bitmap); } 但是折腾了好几天的 Python ,作为一个单纯的爱好者来说,如果每次都是这么折腾的话,那我学习这个又能做什么?谁能指条明路出来?
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