One image.
Four plates.
Separate your image, tune the screened positives and take real files to your workbench.
$3.99 once · iPhone & iPad
App Store submission in progress. No subscription or in-app purchases.
Explore the workflow ↓
City terraces — original study, actual app export.
Image → plates → files
A complete separation study.
01 / Separate
Import a PNG or JPEG from Files. Inspect cyan, magenta, yellow and black positives together.
02 / Adjust
Change angle, density, gamma and black share. Zoom actual pixels, study ink visibility, undo changes and save settings presets.
03 / Export
Build eight files: aligned five-page PDF, four positive PNGs, composite PNG, settings CSV and editable project JSON.
Size you can check.
Choose 150 or 300 DPI, 12–50 lines per inch and A4 or Letter PDF. Actual dimensions are shown before export; requested width is reduced to fit the page or 2000-pixel limit. Print at 100% and measure the PDF's 100 mm reference. Registration targets match across the four plate pages.
This is a standard RGB mathematical CMYK screening study. It is not an ICC separation or a calibrated print proof. Check your actual inks, materials and process. No press-ready or moiré guarantee, spot-ink matching, underbase or exposure/mesh calculation.
Support
Email maga40@naver.com with Roselith, your iOS version and the step that needs help. You can include a file you are comfortable sharing; do not send passwords or private information.
Keep up to 24 local projects and eight presets. PNG/JPEG: 8 MiB and 24 MP maximum. Normalized working image: 1600 pixels per axis. Output: 2000 pixels per axis maximum. Backup JSON: 16 MiB maximum. To restore, use Actions → Import project backup. Restore creates a new project. Export backups outside the app before deletion or uninstalling; there is no trash or cloud sync.
Privacy
Effective October 4, 2026. Gobling Company does not collect data from the Roselith app. It has no account, app network requests, tracking, advertising, analytics, third-party SDK or backend. Imported images, settings, presets and projects are stored locally.
Files import and system sharing occur only when you choose them. File providers, system backups and recipients follow your device settings and their own policies. We cannot recover a deleted local project. When you email support, we receive what you choose to send and use it to respond. This public website may be subject to standard hosting request logs; it contains no app telemetry or analytics code.
Contact maga40@naver.com for privacy questions.
Use & output
Use images you own or are entitled to process. Roselith is a digital design-study tool. Screen colors, dot patterns and theoretical separations do not guarantee a particular printed result. Verify dimensions and calibrate your own print process. The App Store purchase uses Apple's standard license terms.