Convert AI to CDL

A sign-production program such as CADlink SignLab may require its native .cdl document, while color-grading systems use .cdl for ASC CDL files. These are unrelated formats, so the destination application and CDL specification must be confirmed before conversion.

What the AI format is

AI is Adobe Illustrator’s native vector format, used by illustrators, print designers, sign makers, and packaging teams. It can contain paths, fills, strokes, text, gradients, transparency, effects, placed images, layers, and document color settings.

AI artwork remains scalable when its vector objects are preserved, but compatibility depends on the application and the Illustrator features used. Fonts, live effects, linked images, clipping masks, and newer Illustrator features may require conversion or flattening during import.

What the CDL format is

CDL is an ambiguous extension with two relevant meanings:

• SignLab CDL: a native document format used by versions of CADlink SignLab for sign layouts and production artwork. It can retain objects that SignLab supports, but it is not a universal vector format.
• ASC CDL: the American Society of Cinematographers Color Decision List, a text-based color-grading format. It stores primary correction parameters such as RGB slope, offset, power, and saturation; it does not store artwork, paths, text, layers, or pixels.

A SignLab CDL file and an ASC CDL file may share the .cdl extension but are not interchangeable. A color-grading application cannot open a SignLab document as an ASC CDL, and SignLab cannot use an ASC CDL as a layout file.

Convert AI to SignLab CDL

Use a compatible desktop version of CADlink SignLab. There is no dependable general-purpose online converter for SignLab’s proprietary document format.

1. Install the SignLab version that matches the recipient’s production system and confirm that its import filters include the AI version being supplied.
2. In SignLab, choose the AI import or open command, commonly under File → Import or File → Open. Select the required artboard, page, scale, units, and placement options.
3. Inspect every imported object. Convert fonts to outlines in Illustrator before import when the receiving computer may not have the same fonts. Check strokes, compound paths, clipping masks, gradients, transparency, linked images, and effects.
4. If the current SignLab release cannot read the AI file, export a compatibility file such as legacy AI, EPS, PDF, or SVG, but use the format supported by that specific SignLab release. Expand or outline elements that must not change.
5. Save the imported document from SignLab in its native .cdl format, then reopen it and verify dimensions, cut paths, fills, text, and production settings.

Saving as SignLab CDL is a format conversion, not a guaranteed preservation of the original Illustrator document. Unsupported effects may be flattened, substituted, or discarded; embedded and linked raster images may also behave differently.

Create an ASC CDL from rendered AI artwork

An AI file cannot be directly converted into a useful ASC CDL because the two formats describe different data. To create an ASC CDL, render the artwork, apply a color grade, and export the grade parameters.

1. In Illustrator, prepare the artwork in the intended color mode and appearance. Expand effects that must be rendered and embed required images.
2. Export a reference image through File → Export → Export As, using a format such as TIFF or PNG and the intended embedded color profile. Transparency is usable only if the grading application and destination workflow support the required alpha channel.
3. Import the rendered image into a grading application such as DaVinci Resolve and place it on a timeline.
4. Apply the required primary grade. ASC CDL can represent basic slope, offset, power, and saturation adjustments, but not masks, windows, keys, curves, blend modes, tracking, or most Illustrator effects.
5. Use the grading application’s ASC CDL export command on the graded clip or node. In Resolve, the command location and wording vary by version. Keep the exported .cdl with the rendered image.
6. Test the file by applying it to the same ungraded render in the target system. A CDL contains correction values, not the source image or the Illustrator artwork.

Online services that convert AI to PNG, TIFF, or PDF do not normally infer a meaningful ASC CDL. They can be used for the intermediate render only when their color-profile handling is acceptable; use desktop grading software to create and verify the CDL.

Compatibility and quality limits

For SignLab conversion, retain the original AI file and compare the CDL document with the source at actual production size. Verify font outlines, spot colors, overprint behavior, hairlines, transparent objects, image links, and cut contours before sending the file to a cutter or printer.

For ASC CDL workflows, the result depends on the rendered image’s color space, transfer function, gamma, profile, and viewing conditions. Use matching color-management settings in Illustrator, the grading application, and the destination system. Applications may clamp values, ignore saturation, or interpret values differently at color-space boundaries.

Confirm the target program, CDL specification, and expected file structure before using any converter. If the recipient means SignLab CDL, use SignLab; if it means ASC CDL, render and grade the artwork instead of treating the task as a direct file-format change.