Scandium 1.0.2 — first release

Scandium is a free, open-source image editor for macOS (Apple silicon) and Windows (x64): layered
documents, a non-destructive pipeline, painting and retouching tools, selections and masks,
adjustment layers, vector shapes, PNG/JPEG/TIFF/WebP/GIF/BMP in and out, and a scripting door for
the command line. GPL-3.0-only; the plug-in SDK interface is Apache-2.0 (nothing in 1.0 loads
plug-ins). No network calls, no telemetry, no accounts.

Both platforms are built from this one tag; the version string inside the application reads 1.0.2. About shows "Build 72dff984a", the identifier of the internal build commit; the public repository's history begins at the release commit, so that identifier does not appear in it.

Downloads

File	Platform	SHA-256
Scandium-1.0.2-macOS-arm64.dmg (66,194,469 B)	macOS 15.4 or later, Apple silicon	cde57e0e6782ce13600f7a77d4f64f88f97217cae2fbbc50ad945c33f2513600
Scandium-1.0.2-Windows-x64.zip (31,110,988 B)	Windows 10/11, 64-bit	c1360f4be7acb555d324b8aaeec60c9716fb6c9dca25c9ae867031b6f7a045d0
Scandium-1.0.2-src.zip (39,619,634 B)	source of the tagged tree	6233627be6a141a3273fb3d4b80a34fbcb3f9eee8865ca48747e616b4aca4360
Scandium-1.0.2-src.tar.gz (38,336,599 B)	source of the tagged tree	a2d4dfd63f25bb579e819e6926d000b5b96bee73e0b4b217bede9499a657bd56
SHA256SUMS	checksums of the macOS and source files above	—

Verify a download with shasum -a 256 <file> (macOS) or certutil -hashfile <file> SHA256 (Windows)
and compare against SHA256SUMS.

Opening Scandium the first time

macOS. The disk image is not notarized and the app carries only an ad-hoc signature, so a plain
double-click is refused. Drag Scandium to Applications, then right-click the app → Open → Open
once; after that it opens normally. (Intel Macs are not supported in 1.0.)

Windows. The build is unsigned: SmartScreen shows "Windows protected your PC" on first run —
choose More info → Run anyway, once. Scandium needs the Microsoft Visual C++ Redistributable
(x64) — install it from Microsoft if the app reports a missing VCRUNTIME/MSVCP DLL.

We intend to ship signed and notarized builds in 1.1.

What is in 1.0

See RELEASE-NOTES-1.0.md (in the repository) for the full description. The tool palette: Move; Rect Select,
Ellipse Select, Lasso, Polygon, Wand; Crop; Heal, Clone; Brush; Eraser (with hardness); Dodge, Burn,
Sponge; Blur, Sharpen, Smudge; Pen; Rectangle and Ellipse shapes; Transform and Perspective. Layers
with masks and 27 blend modes; adjustment layers (Brightness/Contrast, Exposure, Levels, Curves,
Hue/Saturation, Threshold, Invert); filters (Gaussian Blur, Box Blur, Median, High Pass, Add Noise,
Unsharp Mask); .appname documents with full history; import/export of PNG, JPEG, TIFF, WebP, BMP and
GIF, byte-identical on both platforms.

What is not in 1.0 — read before you look for it

Thirty known issues are listed in KNOWN-ISSUES.md (in the repository and in the source archives). The ones you will meet first:
Text, Quick Selection, Warp/Puppet Warp, Liquify/Custom filters, Paint Bucket, Content-Aware Fill,
Slice and Transform Selection are not in 1.0 (their controls are removed rather than shipped
broken); adjustment dialogs have no live preview; Grayscale/Lab documents cannot be exported —
convert to RGB first; the Magic Wand always samples all layers; Heal takes ~22–24 s per stroke on a
3000×1875 image on an M-series Mac (faster on smaller images; optimized in 1.0.1).

Fixed since the first candidate

The list in RELEASE-NOTES-1.0.md § "Fixed since the first release candidate", completed at the tag.
THIRD-PARTY-NOTICES.md (inside the app and in the source archives) carries the copyright lines and
full licence texts for every third-party library and component the bundles ship, on both platforms.

Reporting problems

Check KNOWN-ISSUES.md first. Otherwise open an issue with the platform, the version string from
About, and the steps; attach the .appname document if you can.