how do i find out needed picture size from various parts? (no image defined)
example: button image -> 5 image frames -> 140x23 /5 -> 28x23 each frame
how do i know size from "no image defined" parts?
Appears you have looked at SKS. My suggestion with my permission is to download one of my latest skins. Here is an easy one with all image easy to see. https://www.wincustomize.com/explore/windowblinds/8800/
When you go to each section in my skin opened in skinstudio (SKS) and highlight the image it will give you the image and size will be listed. While it's highlighted and you click edit image it will open the image in your program. EX: Photoshop or whatever you use it should open in it as a .png - .jpg -bmp are standard formats.
PS: Very important. For whatever images you use copy the code from my image into your location when adding an image. Or just add the image and make sure it works fine if not mess with the painting margins to make it look correct. You will also see "TEXT at the bottom in many locations. Click that to change the text color. There is a drop down menu to change different states if you wish. Really just play around and enjoy yourself.
Hope this helps you along your way with what you are trying to do.