Greetings, my name is Luis Eduardo, I'm working on a plugin for QGis for 
general use. The function of the plugin is to create an interface (widget) that 
displays the histogram of the raster files present and facilitates the analysis 
of their statistics. Here is a sample (in Spanish)
https://www.linkedin.com/pulse/desarrollo-de-una-interfaz-para-el-an%25C3%25A1lisis-capas-en-perez-graterol
The first version uses Gdal and numpy for data handling, but I was recommended 
to ensure stability and compatibility to replace Gdal with PyQGis. My 
doubts:1.- I'm doing it, but, I notice that with only PyQGis, it's slower!2.- 
The histogram, generated with QgsRasterHistogram and with 
gdal-numpy-matplotlib, seems to differ in frequencies (I have to check this, it 
could be because of the non data)
It's my first Plugin, I have several other questions, I'll put them gradually :)
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