Source image
JPEG + 300 dpi - no wonder that individual lines are completely indistinguishable in some places.
Вложение:
Рельеф_01.jpg [ 107.8 Кб | Просмотров: 17451 ]
There is no space for gaps between many neighboring lines.
We resample the image up twofold.
Вложение:
Рельеф_02.jpg [ 78.2 Кб | Просмотров: 17451 ]
Increase of sharpness now (contrast between lines and the background).
At the absence of background between neighboring lines the program uses difference between the background and free sides of the lines.
Radius of the Unsharp Mask should be selected right, otherwise some line segments become black.
Вложение:
Рельеф_03.jpg [ 125.7 Кб | Просмотров: 17450 ]
We use the Binarize tool for background deletion before further increase of sharpness.
The first mask - all bright red tints, until short gaps appear in the lines.
Вложение:
Рельеф_04.jpg [ 241.63 Кб | Просмотров: 17451 ]
The second mask - for deletion of black color
Вложение:
Рельеф_05.jpg [ 225.35 Кб | Просмотров: 17452 ]
The Substitute Color command fills selected areas of the image with white
Вложение:
Рельеф_06.jpg [ 268.32 Кб | Просмотров: 17451 ]
Now we blur holes, ledges and SMALL BRIDGES between lines
Вложение:
Рельеф_07.jpg [ 162.19 Кб | Просмотров: 17451 ]
Unsharp Mask again
The lines are thinner now and we may use a mask of a smaller radius.
There are no irrelevant objects - increase of sharpness may be strong:
Вложение:
Рельеф_08.jpg [ 259.28 Кб | Просмотров: 17451 ]
Background extraction. "Blue" level 1-255
(i.e. the left slider is just about to touch the edge of the histogram).
Вложение:
Рельеф_09.jpg [ 230.85 Кб | Просмотров: 17451 ]
Binarization + Inversion
Вложение:
Рельеф_10.jpg [ 186.39 Кб | Просмотров: 17452 ]
Creation of a new project
Вложение:
Рельеф_11.jpg [ 214.49 Кб | Просмотров: 17450 ]
Editing of vector data is much more difficult in ET 7.99 than in 8.7,
but we shall simplify the situation.
Lines may be separated IN THE IMAGE applying Rasterization of vector data.
We draw separating vector lines 2 px wide.
Вложение:
Рельеф_12.jpg [ 219.31 Кб | Просмотров: 17450 ]
Line inprinting into the image
Вложение:
Рельеф_13.jpg [ 123.95 Кб | Просмотров: 17451 ]
Вложение:
Рельеф_14.jpg [ 119.52 Кб | Просмотров: 17448 ]
Vectorizing
Вложение:
Рельеф_15.jpg [ 188.28 Кб | Просмотров: 17450 ]
Deletion of particularly wry line ends with "scissors" of the Editor before Breakup Joining (keeping Ctrl down)
Вложение:
Рельеф_16.jpg [ 96.94 Кб | Просмотров: 17449 ]
Manual joining of a long (problem) breakup
Вложение:
Рельеф_17.jpg [ 215.1 Кб | Просмотров: 17451 ]
Automatic joining of other breakups
Вложение:
Рельеф_18.jpg [ 179.09 Кб | Просмотров: 17450 ]
Line form optimization
Вложение:
Рельеф_19.jpg [ 119.1 Кб | Просмотров: 17449 ]