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I don't think your issue is with the clip of the rasters, it is with
how the software you are using sets the scale for the display of the
layer.<br>
<br>
When you clip a layer in QGIS or directly with gdal_translate, the
default is to leave the pixel values exactly as they are, which is
generally what you want. After all, if the software rescaled the
max/min to some fixed value, then when you tried to display these
side-by-side or reassemble them into a single image the values
wouldn't make sense. <br>
<br>
The issue you apparently are facing is that by default on loading a
raster the software you are using finds the min and max value and
scales the display to span that full range, which is what QGIS does
by default with raster layers. (The exact details of the scaling are
determine by settings in the Settings -> Raster tab.)<br>
<br>
Without knowing what your display software is I can't suggest a
solution. <br>
<br>
<br>
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