The night light lithophane tool at https://LithophaneMaker.com turns any photo into a night light lithophane (including the adapter) in a few minutes
You can watch an instructional video on how to use the tool here: https://www.youtube.com/watch?v=LjqbxPcJ0yk
A few days ago I read an instructables about how to make a night light lithophane that had 6 steps to it: 1) create the lithophane model, 2) scale the model to the desired size, 3) prepare the modelling software, 4) draw a lithophane to night light adapter, 5) combine the adapter with the lithophane, and 6) 3d print the lithophane. I decided then and there to make a design tool to reduce the time it takes to make a night light lithophane, because I knew then that a lot of people were wasting their time. It seems that I have successfully turned that 6 step process into a 2 step process: 1) turn an image into a night light lithophane in 1-2 minutes, and 2) print the lithophane from the stl. I hope this tool adds value to you.
What you probably need to know is "how does the tool work?" Well it turns out that just a few dimensions really matter to most people (however, I am definitely interest in your feedback which you can send to firstname.lastname@example.org), and I've put the capability in place to let you change those dimensions. Those dimensions are defined in the above picture (which is also present on the tool's page). The "slot diameter" and the "adapter thickness" dimensions are important to make sure that the lithophane is compatible with the night light that you have.
The size of the lithophane is mostly determined by the "lithophane height" dimension. The other image dimension is determined by the "lithophane height" and the "picture aspect ratio". For the design tool's viewing purposes, you can specify an aspect ratio, but the final lithophane will use the aspect ratio of the image that you upload. Note that the aspect ratio is defined as the image's width divided by the image's height.
Finally, you can use a combination of the "center of curvature shift" and the "image arc angle" to control how close the lithophane is to the light and how flat the lithophane is. To make the lithophane very flat, lower the "image arc angle" and increase the "center of curvature shift."
This quick overview captured the tool as it is at the time of this post. Please send me your suggestions for improvements or any bugs that you may find by emailing us at email@example.com