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This tutorial will demonstrate how to unmask an image that has had both Flip masks and FL Mask applied to it.

Example imageEdit

Tutorial FL Flip

Solving the imageEdit

The image has the unmistakable spiral shape of an FL Mask. But if you select the region and immediately attempt an FL Mask, you will only scramble the image further!

This image was produced via a combination of several Flip masks and several FL masks. They must be undone in the correct order.

Where's the flips?Edit

Think about how FL works, perhaps brush up on the FL Mask page itself.

FL divides the image into a spiral beginning from the bottom left corner of the image. Here's a crop of an example image, plus with lines to illustrate.

Example FL croppedExample FL cropped with lines

An image masked with FL will typically always have a trail leading into the bottom left corner. If you check the image we are working with, the trailing corner is not in the bottom left, because it has been flipped to the top left.

Tutorial FL Flip croppedTutorial FL Flip cropped with lines

This is the critical clue that tells us that the first step is to vertically Flip the image so that the trailing corner is on the bottom left. Then we can continue with an FL mask.

Consequent masksEdit

So far, we've used:

  1. Flip up-down
  2. FL Mask

But completing the above two steps will not complete the image. It has several layers of flips and FL masks, and each can be solved by finding the trailing corner and flipping it to the bottom left before performing an unscrambling FL mask.

  1. The first FL (which we just solved) had a trail that has been flipped to the top left.
  2. The second FL has a trail which has been flipped to the top right.
  3. The third FL has a trail which has been flipped to the top left.
  4. The fourth FL has a trail which has been flipped to the bottom right.
  5. The fifth FL has a trail which has been flipped to the top right.

SolutionEdit

This file was created by editing File:Example 2.png (640px thumbnail).
The steps to reproduce it are:
  1. Original image is File:Example 2.png (640px thumbnail)
  2. 1 × FL Mask
  3. 1 × Vertically Flip
  4. 1 × Horizontally Flip
  5. 1 × FL Mask
  6. 1 × Horizontally Flip
  7. 1 × FL Mask
  8. 1 × Vertically Flip
  9. 1 × FL Mask
  10. 1 × Horizontally Flip
  11. 1 × Vertically Flip
  12. 1 × FL Mask
  13. 1 × Vertically Flip
The steps to solve it (automatically generated) are:
  1. 1 × Vertically Flip
  2. 1 × FL Mask
  3. 1 × Vertically Flip
  4. 1 × Horizontally Flip
  5. 1 × FL Mask
  6. 1 × Vertically Flip
  7. 1 × FL Mask
  8. 1 × Horizontally Flip
  9. 1 × FL Mask
  10. 1 × Horizontally Flip
  11. 1 × Vertically Flip
  12. 1 × FL Mask
  13. Original image is File:Example 2.png (640px thumbnail)
Mask information
Rotate RGBXOR 0x80FlipNegativeGlass BlocksWin MaskMeko MaskFL MaskQ0 MaskCP Mask

ReviewEdit

In this tutorial, we learned about:

  • the trailing corner which is created by the FL Mask
  • how the placement of the trailing corner gives clues for unmasking images produced by a combination of FL and Flips.

Also note:

  • if you use FL mask to unmask an image, and immediately find another apparent FL mask underneath, check the trailing corner. If the corner is in the bottom left (default position), your last FL mask was a misstep.

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