You have to import the picture you want to add to your background as a new layer via Layer > Import/Export > Import > as Paint Layer..., now you select the tool Transform a layer or a selection (Ctrl+T) (Transform Tool in short) from Krita’s so-called Toolbox on the left. After you have selected the Transform Tool you have two possible ways to change the size of your imported picture, the first thing you have to obey is that the layer is selected (or active), then you click once on that new imported picture while the Transform Tool is selected, if the layer wasn’t active for the Transform Tool before now it will be, and you can “grab” it at its corner or its sides to scale it per eyeballing, if you grab a corner and simultaneously hold down your SHIFT-key, you can scale it without changing its aspect ratio, if you don’t hold down SHIFT it will lose its original aspect ratio.
The other method to scale the new imported layer is via the Tool Options Docker options of the Transform Tool. So, please open Krita’s Tool Options Docker while the Transform a layer or a selection (Ctrl+T) (Transform Tool) is selected, there you will now see the options of the Transform Tool and have to select Scale. If your scaling should preserve the aspect ratio, you must close the two symbolized chain-links through clicking on them, now you can manipulate the size of your imported layer by changing the value that is displayed.
To remove the background of your imported picture, you have different options in Krita. It begins with simply erasing it when it is only a small and easy to remove background. Depending on its size and how it is “interconnected” with the part of the picture you don’t want to remove, it can get harder. In that case, we often use different types of our selection tools, to remove the unwanted parts step by step.
We have the following types of selection tools:
Magnetic Curve Selection Tool
Bezier Curve Selection Tool
Similar Colour Selection Tool
Contiguous Selection Tool
Freehand Selection Tool
Polygonal Selection Tool
Elliptical Selection Tool (J)
Rectangular Selection Tool (Ctrl + R)
The different selection tools (can) offer different Tool Options. And with their tool options, which you will find at the same position “in the same Tool Options Docker” which you used before with the Transform Tool (because the Tool Options Docker is nothing more than a kind of host for the options of the tools you select from the Toolbox), you can Add things to a selection you make, you can Subtract, intersect, Replace and use Symmetric Difference in combination to get the result that suits your needs.
You can choose what your selection refers to, which is called a reference.
And because the selection tools offer so many possibilities, I would like to recommend Krita’s manual on this topic, which is usually well written and definitely informative and worth reading. Because without knowing your exact situation, I could speculate endlessly and still miss the mark when it comes to your issue.
Another way to remove the background would be the G’MIC-Filter Extract Foreground [Interactive] found in Krita under Filter > Start G'MIC-Qt, please do refer to the description in the G’MIC-Filter.
You will probably also want to use Krita’s well written manual:
That is where the link to Selections is found, I had put above ↑ :
Here, you can read more about editing selections:
Maybe, you are also interested in selection masks:
About G’MIC there isn’t much, but:
I think that other forum members will be able to offer even more ways to remove the background from your imported picture.
By the way, for support requests, you should always add at least your standard information about your working conditions, which are:
The operating system you use and in which version you use it. So not only “Windows” but please “Windows 10 Pro”, “Windows 10 Home”, “Windows 10 Edu”, etc.
The version number of Krita you use, and from where you got it. And also here is true that we want the full version number, like Krita 5.2.14, and if you use nightly versions add the GIT number too. The most easy way is usually via the menu Help > Bug Report where it is written behind Version:
In case that you use Windows, please tell us also if you use the installer or the portable version.
A good screenshot depicting your issue often helps more than many other things and a thousand words. Please do not take a photo with your smartphone, create a real screenshot, and if you don’t know how ask your preferred search engine for: “how to create a screenshot with Android (ChromeOS, Linux, macOS, Windows)?”
Please include the whole Krita window, including title bar and status bar, select the layer in the Layers Docker, put the tab with the Tool Options Docker in front and drag it fully open so it and its content can be seen.
In case of issues with your input devices, like stylus/graphics tablet, mouse, etc., always add manufacturer and the exact model name and number/letter combination. Like Huion, H1060P for instance.
Michelist