我在将虚线参数传递给 cmd.exe 以执行 (Python) 脚本时遇到问题。
确实有效的代码(没有虚线参数):
ProcessStartInfo psi = new()
{
FileName = "cmd.exe",
Arguments = $"/c \"rembg i {inputPath} {outputPath}\"",
RedirectStandardError = true,
RedirectStandardOutput = true,
};
Process proc = Process.Start(psi);
string output = proc.StandardOutput.ReadToEnd();
string error = proc.StandardError.ReadToEnd();
await proc.WaitForExitAsync();
不起作用的代码(带有虚线参数):
ProcessStartInfo psi = new()
{
FileName = "cmd.exe",
Arguments = $"/c \"rembg i -a -ae 15 {inputPath} {outputPath}\"",
RedirectStandardError = true,
RedirectStandardOutput = true,
};
Process proc = Process.Start(psi);
string output = proc.StandardOutput.ReadToEnd();
string error = proc.StandardError.ReadToEnd();
await proc.WaitForExitAsync();
有趣的是,直接在 cmd shell 中运行时,这两种情况都会产生正确的结果:
rembg i INPUT_PATH OUTPUT_PATH
或者:
rembg i -a -ae 15 INPUT_PATH OUTPUT_PATH
即使在 cmd shell 中直接作为 cmd 进程运行,它也可以工作,例如:
cmd /c "rembg i -a -ae 15 INPUT_PATH OUTPUT_PATH"
除非我遗漏了一些非常明显的东西,否则问题似乎在于将虚线参数传递给脚本,该脚本直接从 cmd shell 以及从 shell 启动新的 cmd 进程时正常工作。
编辑:
这是在
StandardError
内收到的错误,源自 rembg
:
Traceback (most recent call last):
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 197, in _run_module_as_main
return _run_code(code, main_globals, None,
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 87, in _run_code
exec(code, run_globals)
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\Scripts\rembg.exe\__main__.py", line 7, in <module>
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\site-packages\click\core.py", line 1128, in __call__
return self.main(*args, **kwargs)
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\site-packages\click\core.py", line 1053, in main
rv = self.invoke(ctx)
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\site-packages\click\core.py", line 1659, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\site-packages\click\core.py", line 1395, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\site-packages\click\core.py", line 754, in invoke
return __callback(*args, **kwargs)
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\site-packages\rembg\cli.py", line 87, in i
output.write(remove(input.read(), session=new_session(model), **kwargs))
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\site-packages\rembg\bg.py", line 116, in remove
cutout = alpha_matting_cutout(
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\site-packages\rembg\bg.py", line 52, in alpha_matting_cutout
alpha = estimate_alpha_cf(img_normalized, trimap_normalized)
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\site-packages\pymatting\alpha\estimate_alpha_cf.py", line 53, in estimate_alpha_cf
L = cf_laplacian(image, **laplacian_kwargs, is_known=is_known)
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\site-packages\pymatting\laplacian\cf_laplacian.py", line 168, in cf_laplacian
_cf_laplacian(image, epsilon, radius, values, indices, indptr, is_known)
File "C:\Users\sven.mijic\AppData\Local\Programs\Python\Python39\lib\site-packages\pymatting\laplacian\cf_laplacian.py", line 8, in _cf_laplacian
assert d == 3
AssertionError
通过一些额外的测试,我找到了它的工作方式。
因此,在
rembg
之前处理过图像之后,SixLabors.ImageSharp
脚本将作为 C# 代码的一部分运行。
但是,当我将图像保存为 PNG 类型(使用
Image.SaveAsPngAsync()
)时,表示 alpha 抠图的 rembg
脚本的附加破折号参数将不起作用。当我将图像保存为 JPEG (Image.SaveAsJpegAsync()
) 后,Alpha 抠图就完成了。否则,如果没有 alpha matting 参数,rembg
脚本将正确执行 PNG 格式,这就是为什么我不怀疑图像格式本身是问题所在。
如果其他人能够更清楚地说明其工作原理,将会很有帮助。我认为这是由于不同图像格式及其处理的性质造成的。否则,我希望仅此一项就可以帮助其他遇到同样问题的人。