Category Archives: Art

Art, Movies

Add effect to movie using bash

mkdir -p videoframessource videoframes
ffmpeg -r 60 -i sweden.mp4 videoframessource/%05d.png
cd videoframessource
ls *png | while read file ; do ../convert2comic $file ; echo -n "." ;done ; echo ""
ffmpeg -f image2 -r 60  -i videoframes/%05d.png  -vcodec libx264 final.mp4
#!/bin/bash
# convert script .. call me convert2comic
convert -quiet $1 +repage -depth 8 -selective-blur 0x5+10% ./tmp1
convert ./tmp1 -level 0x80% -colorspace gray -posterize 6 -depth 8 -colorspace sRGB ./tmp2
convert ./tmp1 '(' ./tmp2 -blur 0x1 ')' '(' -clone 0 -clone 1 -compose over -compose multiply -composite -modulate 100,150,100 ')' '(' -clone 0 -colorspace gray ')' '(' -clone 3 -negate -blur 0x2 ')' '(' -c
lone 3 -clone 4 -compose over -compose colordodge -composite -evaluate pow 4 -threshold 90% -median 1 ')' -delete 0,1,3,4 -compose over -compose multiply -composite ../videoframes/$1

# Another nice effect
convert frame.png \( +clone -negate -blur 0x6 \) -compose ColorDodge -composite -modulate 100,0,100 out.png
Art

Layer effect Art proof of concept

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I took a picture, converted it to grayscale.

Then used Inkscape trace bitmap, brightness cutoff.
With some other options to get multiple gray layers.

I printed these on transparant sheets, using a laser printer.

Made 7-8 layers with a light behind it, it produces a really cool effect.

3dprinting, Art

Laser engrave tools

For my winerack i engraved some wooden panels.

When doing so, i needed to fix the height of the engraver to get the focus of the beam right.

At start i removed all Z positions from the GCODE file after calibrating. Later i used a script wrote that fixed the height setting to 110.

#!/bin/bash
# Usage: confirm height focus at 110
# ./scriptname filetofix.gcode
myz=110
cat "$1" | sed s/Z1/Z${myz}/g | sed s/Z6/Z${myz}/g > "fixed.$1"

Another tool i made is the one below, it takes a GCODE file, calulates where the borders are (min/max x and y)
And sets the FAN2 (laser intensity to a minimum)
After that it generates GCODE to draw a box wherein the to be engraved object is made

Now you can run the GCODE file multiple times to position it on the wood to you can get the minimum of spoils.

#!/bin/bash
# Usage: scriptname file.gcode 
# It wil create a pointtest file for test running
myz=110
MAXX=$(cat "$1" | grep "G0 X" | awk '{ print $2 }' | cut -c2- | sort -n | tail -1)
MINX=$(cat "$1" | grep "G0 X" | awk '{ print $2 }' | cut -c2- | sort -n | head -1)
MAXY=$(cat "$1" | grep "G0 X" | awk '{ print $3 }' | cut -c2- | sort -n | tail -1)
MINY=$(cat "$1" | grep "G0 X" | awk '{ print $3 }' | cut -c2- | sort -n | head -1)

cat > "pointtest - $1" << EOF
;BingoStart
G90
M17 Z
G0 F3000
G0 Z${myz} F3000
M18 Z
G0 X${MINX} Y${MINY}
M106 S2
G0 F3000
G0 X${MINX} Y${MAXY}
M106 S2
G0 F3000
G0 X${MAXX} Y${MAXY}
M106 S2
G0 F3000
G0 X${MAXX} Y${MINY}
M106 S2
G0 F3000
G0 X${MINX} Y${MINY}
M106 S2
G0 F3000
G0 X${MINX} Y${MAXY}
M106 S2
G0 F3000
G0 X${MAXX} Y${MAXY}
M106 S2
G0 F3000
G0 X${MAXX} Y${MINY}
M106 S2
G0 F3000
G0 X${MINX} Y${MINY}
M106 S2
M107
;end
EOF

GCODES

  • M17 Z – disable Z movement
  • G0 – rapid move
    G0 X100 Y100 (Goto 100,100)
    G0 F3000 (speed)
  • M106 – set fan speed (I my case, this is laser intensity)
    M106 – S2
  • G90 – set absolute coordinates
  • M107 – fan off

More info about gcodes: http://www.science.smith.edu/cdf/pdf_files/Techno_GCODE%20Commands.pdf

Art, Computer, Photography

Wacom tablet doesn’t behave

Changed some code controlling my wacom drawing tablet.
I use this one to draw Art, diagrams and touch up photo’s.

When using multiple screens, i had the problem it would stretch the draw area over multiple screens, streching the ratio. Or it took the work screen to work on.

#!/bin/bash
# using xinput here, check post about two mouses/keyboards on one machine

# Use xrandr to check names check 
MONITOR="DP-1"
PAD_NAME='Wacom BambooFun 6x8 Pad pad'

#undo
xsetwacom --set "$PAD_NAME" Button 1 "key +ctrl +z -z -ctrl" 
xsetwacom --set "$PAD_NAME" Button 2 "key e"
xsetwacom --set "$PAD_NAME" Button 3 "key h"

ID_STYLUS=`xinput | grep "Pen stylus" | cut -f 2 | cut -c 4-5`
xinput map-to-output $ID_STYLUS $MONITOR
ID_STYLUS_2=`xinput | grep "Pen eraser" | cut -f 2 | cut -c 4-5`
xinput map-to-output $ID_STYLUS_2 $MONITOR

exit 0

Most of the times i use Krita and Gimp.