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ship hull design

Apr 7, 2012, 14:15
Post: #1
ship hull design
Hello everyone,

As a scale modelist and a newcomer to GIMP, I am trying to obtain a profile, face and top view of a miniature ship - the usual way of representing ship hulls, both in scale and real design. In particular, the frames of the bow and aft sections should be shown in a single picture, as the attached image of a schooner shows. I first thought that a simple cut and paste from reproductions of original plans would do the job, but I soon gave up. Should separate layers for each section of the hull be used instead? As I have no experience with layers, I would very much appreciate any advice or assistance in this regard.

Thank you very much.


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Apr 7, 2012, 18:01
Post: #2
RE: ship hull design
Thanks for your reply, oftnuts. After having cut one half of a frame section - in this case, it was the ship's bow (face) section - from a .jpg file and saved it to a new file, I cut the aft section from another .jpg file and tried to paste it directly opposite to the bow section, hoping the result would look like the top frames drawing shown in my attached sample. Instead, the second image simply was superimposed on the first one, fully hiding it. I was unable to line them up against one another. I surely must have missed some very basic command.

The .jpg files I used are scanned photographs of the original plans of the ship I am building. Scaling them with GIMP was not a problem. However, I didn't try duplicating layers and cropping out unnecessary parts of the images, as you suggest. That will be the first thing I'll look into and will let you know about the results.

Thank you very much for your help.
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Apr 8, 2012, 14:20
Post: #3
RE: ship hull design
Cutting and pasting worked at last, as you can see on the attached file (I am sending it in .jpg format, as the .xcf file exceeds 26 Mb). I cropped out unnecessary parts of the image with the Scissors Select Tool.

Both aft and bow sections are digital photos of the original plan. Could the resulting image be converted to lines over a transparent background or would you need a complete view of both sections?

I am still trying to get the same result with layers.


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Apr 8, 2012, 20:10
Post: #4
RE: ship hull design
Thank you very much.
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Apr 9, 2012, 13:54
Post: #5
RE: ship hull design
Here is what I get, hopefully the right way. The attached .jpg file only shows the lines on white background. The .xcf image actually shows the lines and whites over the background layer (I tried to attach a .png copy of it, but somehow it got stalled).

Thank you for the "exact-aligner" script, which should be very useful indeed. I surely will give it a try. Btw, I hope I didn't spoil your lunch cake...


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Apr 11, 2012, 19:19
Post: #6
RE: ship hull design
The "exact-aligner" script seems to work very well on details of an image. However, trying to align larger pictures into a single one is more problematic. The attached image will show you the result of my unsuccessful attempt at aligning two sections in top view of the aft part of a ship. Both pictures do get aligned, but not quite as they should at their intersection points, even after several corrections of rotation and scaling. Moreover, the left part of the image, which belongs to the background picture, remains blurred, with a low contrast.

Is there any way of improving this?


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Apr 14, 2012, 09:44
Post: #7
RE: ship hull design
Thanks for the link. Unfortunately, I had a problem loading the page, as I get a "link broken down" message. Would I get another chance?


(Apr 14, 2012 00:29)ofnuts Wrote:  Just found this:

http://registry.gimp.org/node/24248
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Apr 14, 2012, 13:09
Post: #8
RE: ship hull design
Finally managed to download and install the plug-in for image alignment, so please disregard my last message. Thank you very much for this link. Will let you know about possible results. Meanwhile, I got a full top view of the ship I am modeling with a simple cut and paste in GIMP, sufficient though for importing the image to a 3d modeling and rendering software. Also, first attempts with Hugin are giving promising results.
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