"Gluing" maps together for roll20?

Hi you clever gamers:-) I have some pdf-copied modules and some maps that, when they were scanned, dont fit one page. how can I, if I can, "glue" them into one map and thus use in this great gaming system? Some are more than to pages, actually I think the largest is 4 pages large! It would be nice to be able to, else we have to have players on several different pages, in roll20, eventhough they would be fighting next to each other.

You can put all the jpgs all on one page and move them around in Roll20, can't you? If you want to make them one nice graphic and aligned to the grid then you would need most likely to do a little work with them in a graphics program like Photoshop (or free one like GIMP). If you like send me links the the graphics (dropbox or something like that) and I'll put them all together for you.

GIMP? I'll try that, thx if that dont work, then maybe I will put in dropbox. but first I try GIMP.

well files can`t be larger than 5mb, so it seems it will be impossible to glue 4 pages and use in roll20? thx anyway!

Resolution on Roll20 is 72 dpi. The average graphic meant for print is typically 300 to 600 dpi. Reducing this resolution (while keeping the dimensions the same) would cut down on the size of your file. You could also tweak your jpg compression from the highest levels to something that is lower, but still acceptable. Of course, this means that you might lose some detail, but if it is important enough, you will find a way to make it work.

I always just save a version in paint of each part, then "stitch" them together using paint by creating a new painting and adding each piece one by one and aligning the grids correctly. It takes a little time at first but after a couple of tries you'll be cruising through it in no time. Oh, and I save the final, stitched-together map as a JPEG to save size. Hope that helps!

I prefer using Inkscape, as you can make the edges and corners "snap" together.

I am curious why you need to glue the images together for use in Roll20. You can upload multiple images and lay them out side by side. If you need help with that please let me know.

Oliver G. said: well files can`t be larger than 5mb, so it seems it will be impossible to glue 4 pages and use in roll20? thx anyway! Your map does not need to be one image. You can upload multiple images and put them all on the map layer. For any images which do not have transparency, you should make them JPGs, as they will compress better; most maps will not have any transparency. For very large maps, I recommend splitting it up into multiple parts. For example, if each map piece is as large as the screen (or larger), then the player will never see more than 4 pieces of the map (or 2 pieces, if the map is a row or a column), and their computer won't have to hold the other images in memory.

Brian , as of late last year Roll20 divides up large images during processing to minimize the processing required.

Cool, didn't realize that. Do you know what threshold Roll20 uses for that optimization? In any case, splitting up a large image can still help get it under the 5MB limit. =)

I do not know the threshold (I am not a Dev), I do know that very large maps that used to cause performance problems do not seem to cause them after the change. Good point regarding the 5MB limit. :)

Whoa, that was a lot of ideas guys! it just so happens that....I am a complete idiot when it comes to computers and how to get then to do what I want them to do. The pdf module, most likely illegal (I got it from an former coworker), is a rather large campaign and has a lot of maps, some a lot larger that a normal page. Gauss, how can I lay them side by side in Roll20? I cant see how. And how do I lower the resolution? When i save as a jpg? Maybe its me? :-)

I think I see your problem in your phrase "some a lot larger that a normal page". You can increase the size of a page. Click on the blue tab in the top right corner. Go to the map you are working on and click the page settings icon. Increase the page size and hit ok. Now your pages are any size you desire so you should be able to set up the images side by side and see the entirety of one large image.