gtutor_tileit has been updated in preparation for an upcoming cookbook article on tiling surfaces, primarily a math expression oriented recipe. Commit 05a01d18575c has the current script. Sun May 16 14:57:19 2021 UTC. It will work its way to the server shortly for people with current gmic cli. No gimp/Krita/8bf plug in yet. Cookbook article first. Commit notes:
modified: include/garry_osgood.gmic
gtutor_tileit:
1. Removed provisional coloring. Mosaics read color and luminosity from selected images
See ccount. Parameters basec and offsc have been removed.
2. Generate tilings with or without light/shadow rendering. Use fcolor switch.
Defaults to False: render light/shadow on tiles.
3. Set tile size relative to image size. relative size 1.0 → 2.5% of the image diagonal.
4. Bug: lightangle not being used. Fixed. Set light angle from -180° to 180° inclusive.
gtutor_tileit help:
Generate a mosaic from an image. Works best with line art cartoons with flat color.
disrupt=5 Rotates, scales and displaces tiles. Suggest 0-10.
tsize=1.0 Tile size relative to image. 1.0 → tile diagonal is 2.5% of the image diagonal.
spread=1.5 Increasing promotes dropped tiles, gaps at junctions and runs. Suggest 0-3.
soft=0.5 Soften and dull shadows and highlights. Suggest 0-5.
fillholes=1 True: Fill gaps and holes. No alpha channel.
False: Leave gaps and holes. Image has alpha channel.
lightangle=45° Degrees: -180° – 180°. Lighting angle.
45°: Light appears to stream from viewer's upper left.
ccount=4 Set number of dominant colors, taken from those most frequently occurring in source.
fcolor=0 True: Flat color tiling without lighting and shading.
False: Do tile lighting and shading.
Play files:
-
ampersand_bluegold.svg. Continues my ongoing obsession(s) with the Goudy 1911 ampersand.
-
pompeiimask.svg. Loosely based on theatre mask mosaics seen in some villas in the Roman city of Pompeii.
Some results:
-
Defaults
Disruption: 5. Tile size: 1.0. Tile spread: 1.5. Highlight softening: 0.5. Holes: filling. Light angle: 45° Color count: 4 and shaded color. -
Smaller tiling and more colors
Disruption: 0.25. Tile size: 0.25. Tile spread: 0.75. Highlight softening: 8. Holes: leaving. Light angle: 90° Color count: 16 and shaded color. -
Increasing disruption and shrinking tile size, also blurring to introduce intermediary color tiles. Flat, unshaded color (Light angle, soft: accepted but ignored).
Disruption: 5. Tile size: 0.25. Tile spread: 0.5. Highlight softening: 8. Holes: leaving. Light angle: 135° Color count: 32 and unshaded color. -
Setting spread to a high value creates beaded effect. Consider compositing such beaded results with other tiled images of the same source, but made with different settings.
Disruption: 0.125. Tile size: 0.25. Tile spread: 2. Highlight softening: 0. Holes: leaving. Light angle: -75° Color count: 32 and shaded color.
gtutor_tileit: 05a01d18575c Sun May 16 14:57:19 2021 UTC
“”"
#@cli gtutor_tileit : 0<=_disrupt<=10,0.05<_tsize,0.25<=_spread,0<=_soft,_fillholes:True,-180<=_lightangle<=180,2<=_ccount<=32,_fcolor:False
#@cli : Generate a mosaic from an image. Works best with line art cartoons with flat color.
#@cli : disrupt=5 Rotates, scales and displaces tiles. Suggest 0-10.
#@cli : tsize=1.0 Tile size relative to image. 1.0 → tile diagonal is 2.5% of the image diagonal.
#@cli : spread=1.5 Increasing promotes dropped tiles, gaps at junctions and runs. Suggest 0-3.
#@cli : soft=0.5 Soften and dull shadows and highlights. Suggest 0-5.
#@cli : fillholes=1 True: Fill gaps and holes. No alpha channel.
#@cli : False: Leave gaps and holes. Image has alpha channel.
#@cli : lightangle=45° Degrees: -180° – 180°. Lighting angle.
#@cli : 45°: Light appears to stream from viewer’s upper left.
#@cli : ccount=4 Set number of dominant colors, taken from those most frequently occuring in source.
#@cli : fcolor=0 True: Flat color tiling without lighting and shading.
#@cli : False: Do tile lighting and shading.
gtutor_tileit : -check “${1=5}>=0 && 1<=10 && {2=1.0}>=0.05 && {3=1.5}>=0.25 && {4=0.5}>=0 && isbool({5=1}) && {6=45}>=-180 && {6}<=180 && {7=4}>=2 && {7}<=32 && isbool({8=0})”
-echo[^-1] "Applying faux tiling to selected images. Disruption: “{1}". Tile size: "{2}”. Tile spread: “{3}". Highlight softening: "{4}”. Holes: "${arg\ 1+!5,filling,leaving}". Light angle: "{6}“° Color count: “{7}" and "{arg\ 1+!$8,unshaded,shaded}” color.”
Parameters
disrupt=$1
tsize=$20.025sqrt(w^2+h^2)
spread=$3
soft=$4
fillholes=$5
lightangle=$6
ccount=$7
fcolor=$8
-repeat !
-local[>]
# Color quantization + black
-remove_opacity.
+colormap. ${ccount},1,2
-index… .,0,1
-round 1
1
-append[-2,-1] x
-name. pallette
-move[pallette] 0
-name. qcolor
+luminance[qcolor]
-name. qlumin
-normalize[qlumin] 0.6,1
# Outline qcolor
-input 100%,100%,1,1,'I(#-2,x,y)==I(#-3,0,0)?1:0'
+deriche. 1,1,x
-deriche.. 1,1,y
-sqr[-2,-1]
-add[-2,-1]
-fill. 'i>={iM/3.0}?1:0'
-name[-1] outline
# Cost: perturbs distance to outline measure, a basis of tile irregularity
-input 100%,100%,1,1
-name[-1] cost
-plasma[cost] 4,4,{$disrupt}
-normalize[cost] 0,{$disrupt/4.0}
# Distance to outline + distance perturbation
+distance[outline] 1,[cost],1
-name. distvar
+distance[outline] 1
+add[-1,-2]
-remove[-3,-2]
# True distance: basis for marking off distance by tile height
[-1]
-name[-1] truedistance
# Orient: source of tile rotation
-name[-2] orienter
# Make Warper: distorts tiles
-gradient[cost] xy
-append[-4,-3] c
-blur[-3] 1,1,1
-normalize... {-1.5*$disrupt},{1.5*$disrupt}
-name... warper
# Measure out and scribe tile center-to-center lines
-round[truedistance] {$spread*$tsize}
+deriche[truedistance] 1,1,x
-deriche[truedistance] 1,1,y
-sqr[-2,-1]
-add[-2,-1]
-fill. 'i>{iM/4.5}?1:0'
# Compute orientation field
-gradient[orienter] xy
-append[-3,-2] c
-orientation[orienter]
# Plotting field:
[-1],[-1],1,4,'[-1,-1,-1,0]'
-name. plottingfield
# Draw tiles on a plotting field:
# (1) xfrm: encodes tile translations and rotations
# for tile corner points. (2) tl, tr, bl, br:
# tile corners, expressed in homogeneous
# coordinates.
-fill[plottingfield] ">if(
0<i#-2 && I#-1==[-1,-1,-1,0],
xfrm=eye(3);
xfrm[0]=I#-3[1];
xfrm[1]=I#-3[0];
xfrm[2]=x;
xfrm[3]=-I#-3[0];
xfrm[4]=I#-3[1];
xfrm[5]=y;
tl=mul(xfrm,[-"$tsize",-"$tsize"/2.0,1],1);
tr=mul(xfrm,[ "$tsize",-"$tsize"/2.0,1],1);
bl=mul(xfrm,[-"$tsize", "$tsize"/2.0,1],1);
br=mul(xfrm,[ "$tsize", "$tsize"/2.0,1],1);
polygon(#-1,5,
[tl[0],tl[1]],
[tr[0],tr[1]],
[br[0],br[1]],
[bl[0],bl[1]],
[tl[0],tl[1]],
1,[[I#-7]*i#-6,255]);
polygon(#-1,-5,
[tl[0],tl[1]],
[tr[0],tr[1]],
[br[0],br[1]],
[bl[0],bl[1]],
[tl[0],tl[1]],
1,0xffffffff,[0,0,0,255])
);I"
-cut[plottingfield] 0,255
# Make isovalue targets for lighting height map
100%,100%,1,1,'I#-1==[0,0,0,255]?1:0'
-name. heightmap
# Distort artwork
-warp[plottingfield,heightmap] [warper],1,2,2
# Clean up
-remove[-3--6]
-split_opacity[plottingfield]
-index[plottingfield] [pallette],0,1
-remove[pallette]
-fill.. 'i>=127?255:0'
-fill. 'i>0.05?1:0'
-fill. 'i#-2==0?0:i'
-if $fcolor # Do light and shade?
-if $fillholes
# Fill holes in the plotting field
-fill[plottingfield] 'i#-2==0?I#-5*i#-4:I'
-remove[-2]
-else
-append[-3,-2] c
-fi
-keep[plottingfield]
-else
# Distance from edges: proxy for
# tile height. Shape height with
# power function
-distance[heightmap] 1
-normalize[heightmap] 0,1
-pow. 0.25
-blur. 0.875,1,1
-normalize[heightmap] 0,1
-if {$fillholes==0}
# Poke holes in the height map
-fill[heightmap] 'i#-2==0?0:i'
-else
# Fill holes in the plotting field
-fill[plottingfield] 'i#-2==0?I#-5*i#-4:I'
-fi
-remove[qcolor,qlumin]
# Cheap Fingerpaint Lighting
# Derive shadow, hightlight, color
-normalize[plottingfield] 0,1
# Light
+gradient[heightmap] xy
-append[-2,-1] c
({cos($lightangle*pi/180)}^{sin($lightangle*pi/180)})
-resize. [-2],[-2],[-1],[-1],1
+mul[-2,-1]
-compose_channels. add
-name. light
-cut. {ia},{iM}
-normalize. 0,1
-pow. 0.5
if $soft>0
-blur. {$soft},1,1
fi
# Shadow
-mul.. -1
-mul[-3,-2]
-compose_channels.. add
-name.. shadow
-cut.. {ia#-2},{iM#-2}
-normalize.. 0,1
-oneminus..
-pow.. 2
# Composite
-mul[plottingfield,shadow]
-mul[light] '{iM#0}'
-add[plottingfield,light]
-normalize[plottingfield] 0,255
-if {$fillholes==0}
-append[-3,-2] c
-else
-remove..
-fi
-keep[0]
-fi # else doing light and shade
-endlocal
-done
“”"
Off to work on the cookbook recipe. Everybody have fun.