GIMP : Custom 'high pass' filter for sharpening digital images / HD
'Levels' color-adjustment tool is a very useful tool found both in GIMP and Photoshop (and perhaps also in other similar programs)
It allows for tonemapping (improving the tonality of) a digital image through altering the values of high,low and midtones (gamma correction) for all four of the R,G.B and composite color channels,thus offering great flexibility in adjusting the tone of our image
In this video tutorial we present how we can get the most out of this very commonly used and useful color adjustment tool in GIMP
