Page 253 - Web Applications (803) Class 11
P. 253

Pick             Changes  out  a  few  pixels  with
                                     neighbouring ones.














                    Spread           This filter works by swapping a pixel
                                     in  one  location  with  a  randomly
                                     selected pixel from another source
                                     while taking colour transitions into
                                     account.









                    CIE lch Noise filter According  to  CIE  standards,  the
                                     CIE lch Noise filter generates noise
                                     in the active layer or selection by
                                     using  the  Lightness,  Chroma,  Hue
                                     colour model.








                    RGB Noise Filter  The  RGB  Noise  filter  adds  a
                                     normally  distributed  noise  to  a
                                     layer or a selection. It uses the RGB
                                     colour model to produce the noise
                                     (noise  is  added  to  red,  green  and
                                     blue values of each pixel). A normal
                                     distribution means that only minor
                                     noise  is  added  to  the  majority  of
                                     pixels  in  the  affected  area,  while
                                     more  extreme  values  affect  fewer
                                     pixels.

                 Edge Detection Filters
                 Edge detect filters look for lines separating various colours so they can identify an object’s features. They are employed
                 in many creative activities. Before applying edge filters, some blurring is frequently required because it flattens tiny
                 signal ripples and prevents false edges.



                                                                                          Multimedia Design—GIMP     251
   248   249   250   251   252   253   254   255   256   257   258