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Converting scales

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DMDay

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I have a jpg plan for a ship with a scale of 1:14. The size of the plan is 15354 pixels x 9094 pixels.

I want to convert the plan to a scale of 1:24.

I have no idea how to do this. If I knew the new dimensions (in pixels), I could easily scale the jpg plan to the correct size.
 
DMDay said:
I have a jpg plan for a ship with a scale of 1:14. The size of the plan is 15354 pixels x 9094 pixels.

I want to convert the plan to a scale of 1:24.

I have no idea how to do this. If I knew the new dimensions (in pixels), I could easily scale the jpg plan to the correct size.
Click to expand...
Why not use a scale converter? Simple enough and very intuitive.

Online Scale Converter Tool - Scale Modelers World

The Scale Modelers World is an online resource for scale modelers. Here you will find product reviews and articles direct from the workbench.
www.scalemodelersworld.com
 
With a plan or downloaded kit instructions displayed on screen I sometimes superimpose a virtual "screen ruler" (Free download) If the display includes any known dimension the screen ruler can be scaled so that it measures that dimension correctly. Perhaps display your .jpg on the screen and overlay the screen ruler. The screen ruler can be dragged anywhere and can be horizontal or vertical or both.
 
I use the same converter/calculator Jim does. It has been an incredibly valuable reference tool for me. I pray that website never goes down.
 
DMDay said:
I have a jpg plan for a ship with a scale of 1:14. The size of the plan is 15354 pixels x 9094 pixels.

I want to convert the plan to a scale of 1:24.

I have no idea how to do this. If I knew the new dimensions (in pixels), I could easily scale the jpg plan to the correct size.
Click to expand...
You have a number of methods already from everyone. I would just add to check a dimension or two on the scaled version to make sure the original was accurate. Sometimes scans can get distorted. My scanner caused an issue once that I mistook as just a line of corrupt data but it was worst than that. A jpg scan might not be enlarged proportionally which would cause distortion.
 
Thanks for the heads-up. The plan I am using was purchased on-line in a tif file format. I used PhotoShop to reduce the image size and ended up with a nice set of plans at the correct scale. Of course, I had to take it out to a printer since my home printer was much too small. I had 2 copies of the plan printed on heavy paper so I could cut one and use it as a template.
 
Following my earlier post I attach a photo of a screen ruler in use. The computer screen displays the pdf provided by OcCre of their Fram model. On the page displaying the foremast spars I have placed the ruler over the gaff. the small grey widow is part of the screen ruler software that allows control of the ruler scale. I have adjusted this so that the ruler correctly measures the 10cm length of the gaff. In principle I could have scaled the pdf to display a 1:1 representation but taking
measurements would involve the hazardous process of putting a physical ruler against the (curved) screen.
Screen ruler.jpg
 
must be an old crt monitor for curve screen & what appears to be somewhat screen burn in as shown in your picture. what size is your monitor?
 
Davidp said:
must be an old crt monitor for curve screen & what appears to be somewhat screen burn in as shown in your picture. what size is your monitor?
Click to expand...
No, it's a 24" LCD monitor with a concave screen to improve viewing angle. I was lazy in taking a photo of it (not a good idea) rather than doing a screen capture of the image. Here is a better picture.
With this process I can, for example, measure off the positions of the blocks without clearing a space on my work bench to wrestle with large sheets of paper and a ruler.
screen-ruler.jpg
 
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