Roselith Color Plates Downloads & RevenueRoselith Color Plates · App Store

Take an image to four color plates.

Roselith is an offline iPhone and iPad workbench for mathematical CMYK separation and round-dot screening studies. Import your own PNG or JPEG, adjust individual plates and export useful files. All current tools are included in one purchase.

FOUR PLATES IN VIEW
Inspect cyan, magenta, yellow and black positives together. Select a plate to adjust its screen angle, ink density and tone gamma. Adjust common black share in Proof. Undo and redo retain 20 settings changes. Eight named presets can retain your ink and output settings.

STUDY THE OVERLAP
View a digital screened composite and toggle individual inks. Visibility changes the composite only; all four positive plates still export. Original City terraces, Orchard dusk and Color steps studies are optional starting points made for this app. A normal library starts empty.

REAL FILES FOR THE WORKBENCH
Save a print with eight files: a five-page PDF with four aligned plate pages and a composite/settings page; four opaque black-positive PNGs; composite PNG; settings CSV; and editable Roselith JSON. PDF plates share common corner registration targets and a 100 mm reference line. Preview the actual PDF or individual output files, share one file or all eight through the system sheet. Each save creates an independent print; later project edits or deletion never replace it. Reopen Saved prints and restore its embedded source and settings as a separate editable project. Keep up to 24 completed prints / 512 MiB; remove older results explicitly after saving copies elsewhere. Existing complete version 1.0 outputs are recognized in place without changing their eight files. Unrecognized or partial folders remain untouched in Files. Exported settings include measured raster coverage and actual size.

CHOOSE THE OUTPUT
Request 40–160 mm width, 150 or 300 DPI and 12–50 lines per inch. Actual size is reduced when needed to fit 180 × 220 mm or the 2000-pixel-per-axis limit. Files shows exact physical and pixel dimensions. Choose A4 or US Letter PDF; print at 100% and measure the reference before use. High frequency at low DPI has few pixels per dot; use 300 DPI or lower frequency.

KEEP EDITABLE PROJECTS
Keep up to 24 local projects. Your selected project is remembered when you reopen the app. Search, reopen, rename, duplicate or delete. Import a JSON backup to restore the original image and settings as a new project. Make backups outside the app before deleting or uninstalling; there is no trash. Files import accepts PNG/JPEG up to 8 MiB and 24 megapixels; the normalized working image is up to 1600 pixels per axis. Transparent pixels flatten onto white. JSON import supports up to 16 MiB.

ON IPHONE AND IPAD
The phone focuses on a four-plate wall and contextual controls. A wide iPad shows positives, composite and the selected-plate inspector together. Print bench places a large composite beside the output inspector. Native typography, Files, sharing and PDF preview keep the workfl