I thought Qimage applied a sRGB profile to any file that doesn´t contain any,
That is correct ..... BUT ....
.... When Qimage "Printer icc" is set to OFF, the print is NOT colour managed and therefore the image profile is irrelevant.
although the setting from Qimage or printer driver was "No color adjustment".
"No Colour Adjustment" is the DRIVER setting, not Qimage. Setting from within Qimage just means that Qimage remembers it.
Printing a target is a special case where the driver has to be set to "No Colour Adjustment" and "Printer icc" is set to OFF in Qimage.
When printing an image and the printer profile activated in Qimage and "Printer icc" set to ON, it is important that the DRIVER is set exactly the same as the it was for the target print, No Colour Adjustment, paper type and print quality etc.
"No Colour Adjustment" is required for colour managed printing so that the conversion process Qimage does is not corrupted by the driver. In other words, double profiling in some form is prevented.
BTW. your English is very good
Keep the questions coming if mine is not
Terry.