Difference between revisions of "CreatingShieldIconsInGimp"

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* apngasm 3.1.6
 
* apngasm 3.1.6
  
 +
== Create Ship Image ==
  
 
# (if necessary) create a new canvas 112x93
 
# (if necessary) create a new canvas 112x93
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#*# screenshot'ing the HUD
 
#*# screenshot'ing the HUD
 
#*# converting the image to greyscale (TBC how best to do this!)
 
#*# converting the image to greyscale (TBC how best to do this!)
−
# draw guidelines at the ships edges
+
 
−
# create a new layer; transparent background (or black?)
+
== Create Shield ==
−
# use oval select tool to create selection that covers ship, with at least ~6 pixels room around the ship ### TODO replace with the ship outline, expand and feather
+
 
−
#* ensure you have anti-aliasing selected
+
# Using fuzzy select (with zero threshold) select the area outside the ship image; then invert selection
−
#* aim to have the fore/aft edges as close as possible to the
+
#* If necessary modify the selection to better fit the ship, e.g. using the oval select (additive) to round out an irregular shape
−
#* might need to resize the original top down image
+
# Select -> Grow... by 10 (? try 11) pixels
−
# bucket fill the selection with full white
+
# Select -> feather set to 2 pixels
−
# alter the selection (select -> shrink) to be 4 pixels smaller
+
# Create new layer (black background) & select the new layer
−
# bucket fill the selection with full black
+
# Bucket fill: white
−
# alter the selection (select -> grow) to be 2 pixels larger
+
# Select -> Shrink... by 3 (?) pixels  
−
# apply the gaussian blur filter (2 pixels, width & height locked) CONFIRM THE SIZE!!
+
# Bucket fill: black (leaving a mostly 1 pixel full-white outline)
−
# use the colour select tool to select the area inside & outside the oval
+
# Select -> Grow... by 2 pixels
−
# invert the select; then apply it as a layer mask (so you can see where the shield will be in relation to the ship)
+
# Filters -> Blur -> Gaussian blur; aspect locked; 3 (?) pixels
−
# move the layer containing the ship so that it fits correctly inside the shield bubble (including resizing the layer if necessary), OR redo the shield bubble oval so that the ship fits correctly
+
# Filters -> Artistic -> Softglow; 9 (?) pixels
 +
# Use colour select to select all the fully black regions (outside & inside shield); then invert selection
 +
# Layer -> Mask -> Add Layer Mask... using the current selection
 +
# Confirm you can clearly see the ship and the shields don't overlap the ship (unless you really want them to!)
 +
 
 +
== Split Shield into Segments ==
 +
 
 
# through the middle of the oval; create rectangle selection 2 pixels high & shield width, then fill full black
 
# through the middle of the oval; create rectangle selection 2 pixels high & shield width, then fill full black
 
# at the end of each shield (4x ends) create rectangle selection, 2 pixels high & shield width
 
# at the end of each shield (4x ends) create rectangle selection, 2 pixels high & shield width
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WASH, RINSE, REPEAT
 
WASH, RINSE, REPEAT
  
−
# fuzzy select; zero threshold, invert selection
 
−
# grow selection by 8 pixels (may depend on ships shape?)
 
−
# feather by 2 pixels
 
−
# create new layer
 
−
# bucket fill: white
 
−
# shrink by 5 pixels
 
−
# bucket fill: black
 
−
# grow selection by 2 pixels
 
−
# apply Gaussian blur; aspect locked; 3 pixels
 
−
# colour select black outside & inside shields; invert selection
 
−
# add layer mask using selection
 
−
 
−
*** try soft glow; 7-8 pixels, with narrower "outline" (instead of the g-blur?)
 
  
 
TODO: figure out if there's any benefit to creating an ani instead of an apng (maybe uses less ram/texture memory? since apngs auto-expand to full 24bits per pixel?)
 
TODO: figure out if there's any benefit to creating an ani instead of an apng (maybe uses less ram/texture memory? since apngs auto-expand to full 24bits per pixel?)

Revision as of 03:54, 18 February 2017

This is a quick summary of how I created two segment shield icons for the HUD.

I'm writing this down so I remember how to do this, because me not being an artist, it took me ages to figure out how to do this and I don't want to go through the frustration of rediscovering it!!!!

Programs I used:

  • GIMP 2.8
  • apngasm 3.1.6

Create Ship Image

  1. (if necessary) create a new canvas 112x93
  2. Import a top down image of the ship & centre it
    • so far I've grabbed the existing shield anim frame 0
    • might be able to grab other ships by
      1. setting shield anim to be FSO generated
      2. DISABLING shields (or the auto-generated shield bars may overlap the image)
      3. screenshot'ing the HUD
      4. converting the image to greyscale (TBC how best to do this!)

Create Shield

  1. Using fuzzy select (with zero threshold) select the area outside the ship image; then invert selection
    • If necessary modify the selection to better fit the ship, e.g. using the oval select (additive) to round out an irregular shape
  2. Select -> Grow... by 10 (? try 11) pixels
  3. Select -> feather set to 2 pixels
  4. Create new layer (black background) & select the new layer
  5. Bucket fill: white
  6. Select -> Shrink... by 3 (?) pixels
  7. Bucket fill: black (leaving a mostly 1 pixel full-white outline)
  8. Select -> Grow... by 2 pixels
  9. Filters -> Blur -> Gaussian blur; aspect locked; 3 (?) pixels
  10. Filters -> Artistic -> Softglow; 9 (?) pixels
  11. Use colour select to select all the fully black regions (outside & inside shield); then invert selection
  12. Layer -> Mask -> Add Layer Mask... using the current selection
  13. Confirm you can clearly see the ship and the shields don't overlap the ship (unless you really want them to!)

Split Shield into Segments

  1. through the middle of the oval; create rectangle selection 2 pixels high & shield width, then fill full black
  2. at the end of each shield (4x ends) create rectangle selection, 2 pixels high & shield width
    • should have 4x small rectangles
    • might need to be done in two steps? fore/aft ends?
  3. apply the gaussian blur filter (1 pixel, width & height locked)
  4. create a new layer and move fore or aft to it (should have 3x layers)
  5. export image (all layers) as png
  6. use apngasm to create APNG image
    • apngasm -o shipname_shield.png ship_base.png ship_shield_fore.png ship_shield_aft.png
  7. test in FSO

WASH, RINSE, REPEAT


TODO: figure out if there's any benefit to creating an ani instead of an apng (maybe uses less ram/texture memory? since apngs auto-expand to full 24bits per pixel?)

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