This is an image editor with layers and transparency. It supports the OpenRaster format so it can interoperate with MyPaint, Gimp and Krita.
This is modified from LazPaint which is free and open source licensed under GPLv3.
Then LazPaint official website:
https://wiki.freepascal.org/LazPaint
https://github.com/bgrabitmap/lazpaint
Our source code and tutorial:
https://coolleget.com/Products-Info/CoolleImageEditor/CoolleImageEditor.html
Image Editor was started to demonstrate the capabilities of the graphic library BGRABitmap. It provides advanced drawing functions in Lazarus development environment.

Features:
Files: read and write a variety of file formats, including layered bitmaps and 3D files.
Tools: many tools are available to draw on the layers.
Edit/Select: select parts of an image with antialiasing and modify the selection as a mask.
View: color window, layer stack window and toolbox window.
Command line: call LazPaint from a console.
Scripts: scripts are provided to do layer effects. You can as well write your own Python scripts.
Support formats:
.LZP .ORA .PDN .PSD
.BMP
.GIF
.ICO
.JPEG
.PCX
.PNG
.TGA
.TIFF
.XPM
.XWD
.SVG
.arw
.cr2
.dng
.mef
.tga
.pdn
.oXo
.tif
.webp
.xpm
.pbm
.pgm
.ppm
.xwd
.mrw
.nef
.orf
.pef
.raf
.cri
.raw
.sr2
.braw
.bay
.x3f
.3fr
.ari
.srf
.crw
.cr3
.cap
.iiq
.eip
.dcs
.dcr
.drf
.k25
.kdc
.erf
.fff
.gpr
.mdc
.mos
.nrw
.ptx
.pxn
.R3D
.rw2
.rwl
.rwz
.srw