It is currently 21 Feb 2018, 07:01

GIMP TutorialsFinal Flip or not in Fan Illusion (Showcase | Slideshow)

GIMP Tutorials
Post Reply
User avatar
animicule

Script Coder
View: Showcase | Slideshow
Topic Posts: 4/5
Posts: 614
Joined: 10 Jan 2017, 15:25
Cash on hand: 148.06 GLP
Bank: 56,999.00 GLP
Gender: Guy
Location: South Dakota
Operating System: Windows
GIMP Version: 2.9.5
x 169
United States of America

Final Flip or not in Fan Illusion

Post#1 by animicule » 13 Aug 2017, 17:34


Final Flip in fan illusion may be used to complete the illusion
of a 360 degree circle with no seams in the pattern.
Since the Final Flip was made by flipping a 90 degree slice
from the upper left quadrant to the bottom right quadrant there
is just a slight bit of math.

The chart below show in Green the number of slices that
the final flip may work correctly on.
The chart shows
Total Number of Slices :::: Degrees per Slice
If the Number of slices is evenly divisible by 4, (and the subject
was contained in quadrant 3 (the colored quadrant) with rotation
at 0,0) it will work without needing any cleanup.

The numbers in green will be a 'mirror' image and will work. Numbers not in green see the 2nd method.
Attachments
slices degrees.png
slices degrees.png # (19.25 KiB) Viewed 304 times (Watermarked | Thumbnail)
Final Flip 0.png
Final Flip 0.png # (94.4 KiB) Viewed 304 times (Watermarked | Thumbnail)
Final Flip 0a.png
Final Flip 0a.png # (444.58 KiB) Viewed 304 times (Watermarked | Thumbnail)
Last edited by animicule on 14 Aug 2017, 22:36, edited 3 times in total.
0 x




Registered members enjoy ads-free content
User avatar
animicule

Script Coder
View: Showcase | Slideshow
Topic Posts: 4/5
Posts: 614
Joined: 10 Jan 2017, 15:25
Cash on hand: 148.06 GLP
Bank: 56,999.00 GLP
Gender: Guy
Location: South Dakota
Operating System: Windows
GIMP Version: 2.9.5
x 169
United States of America

Post#2 by animicule » 13 Aug 2017, 17:47


Here are some pictures of what is does step by step.

The first picture shows in green the area that will be Flipped Horizonally.
The second shows after the flip and before the Flip Vertical.
The third shows the result of Final Flip.
Attachments
Final Flip 1.png
Final Flip 1.png # (493.83 KiB) Viewed 300 times (Watermarked | Thumbnail)
Final Flip 2.png
Final Flip 2.png # (473.64 KiB) Viewed 300 times (Watermarked | Thumbnail)
Final Flip 3.png
Final Flip 3.png # (475.41 KiB) Viewed 300 times (Watermarked | Thumbnail)
0 x




User avatar
animicule

Script Coder
View: Showcase | Slideshow
Topic Posts: 4/5
Posts: 614
Joined: 10 Jan 2017, 15:25
Cash on hand: 148.06 GLP
Bank: 56,999.00 GLP
Gender: Guy
Location: South Dakota
Operating System: Windows
GIMP Version: 2.9.5
x 169
United States of America

Post#3 by animicule » 13 Aug 2017, 17:53


A way to obtain the same type of result with an outcome with numbers not highlighted in green on the table above follows.

Duplicate your outcome in the layer stack.
Make both layers visible and the top layer the active layer (with the white box around it)
Use the Rotate tool on the bottom layer. Using the chart above, look for your number of
slices and to the right find the degrees per slice. Decide how much area you need to
erase to make a good join. If you need about 50 degrees, then divide 50 by the
number of degrees per slice. If 50 is evenly divisible by degrees per slice, rotate the
bottom layer 50 degrees. If it was not evenly divisible, round up and multiply by degrees per slice.
Here is an example.
Say your number of slices is 40. They are 9 degrees each. you need about 50 degrees.
Divide 50 by 9 degrees (degrees per slice at 40 slices) and the result is 5.55 ( 5 with a remainder). Round up to 6 and
multiply it by 9 and you get 56. The number of degrees to rotate is 56.
After you have the bottom layer rotated then after Making Sure the top layer
is the Ative Layer (with the white box around it) erase the area where the join
is not correct and it should look perfect when you are done.
The final step is the right click with your mouse in the layer area and
choose New Layer From Visible.

You will soon see that you can estimate how much area you need and
just pick an approximate number that is larger than the area you need for your rotation.

If all else fails due to a difficult subject or a poor rotation:
You may need to take the one good slice you have and copy it a number of times,
rotate each of them into position and build your outcome a slice at a time.
Attachments
Final Flip 5.png
Final Flip 5.png # (983.44 KiB) Viewed 294 times (Watermarked | Thumbnail)
Manual Join.png
Manual Join.png # (489.33 KiB) Viewed 291 times (Watermarked | Thumbnail)
Last edited by animicule on 14 Aug 2017, 22:38, edited 1 time in total.
0 x




User avatar
Steve Reid
Script Coder
View: Showcase | Slideshow
Topic Posts: 1/5
Posts: 74
Joined: 20 Jul 2017, 10:55
Cash on hand: 872.36 GLP
Gender: Guy
Location: Barrow in Furness
Operating System: Windows
GIMP Version: 2.9.5
x 37
x 13
Gimp Nation

Post#4 by Steve Reid » 14 Aug 2017, 17:31


I tend to use the second method, I find it easier to get my head around what steps need to be taken to get the task done, I'm still playing with this script and fast filling my computers memory as I'm loath to delete anything :hammer_head:
0 x




User avatar
animicule

Script Coder
View: Showcase | Slideshow
Topic Posts: 4/5
Posts: 614
Joined: 10 Jan 2017, 15:25
Cash on hand: 148.06 GLP
Bank: 56,999.00 GLP
Gender: Guy
Location: South Dakota
Operating System: Windows
GIMP Version: 2.9.5
x 169
United States of America

Post#5 by animicule » 14 Aug 2017, 18:12


I do use the final flip first when I know it will work.
It is really easy to do the seconds way also though.
0 x




Post Reply

Last 20 Members Who Visited This Topic

User avatar leopardo-40 (2), User avatar gnerd (3), User avatar animicule (25), User avatar Pat625 (6), User avatar tim (1), User avatar oldmangrumpy (1), User avatar Steve Reid (3)

  • Similar Topics
    Replies
    Views
    Last post
• Featuring Members' Works (Image Attachments Only) •
1: oldmangrumpy
2: Issabella
3: Issabella
4: Pat625
5: animicule
6: gnerd
7: animicule

Who is online

Users browsing this forum: No registered users and 2 guests