gimp - What does the 'gimp_histogram' procedure require to work?

Question

I do not understand why my call to pdb.gimp_histogram throws a RuntimeError: execution error.

from gimpfu import *

def plugin_main ( timg, tdrawable ):

    pdb.gimp_histogram( tdrawable, 0, 0, 255 )

According to the docs, the function takes four arguments:

• drawable ( type drawable)
• channel to modify ( type int )
• start range ( type int )
• end range ( type int)

I provide all four in the barebones code above, so why is the error thrown?

Answer 1

代码看起来正确（我有类似的代码）。

但是，如果图像是彩色索引的，我会得到同样的错误，而文档说“绘图可能没有被索引。 ”，所以这可能是你的问题吗？

PS：您应该使用命名常量（HISTOGRAM_{VALUE|RED|BLUE|GREEN|ALPHA}）