An image can look excellent in your photo library yet cover text or lose its subject when placed behind a desktop workspace. The problem is usually not a lack of resolution. More often, the image ratio, visual focal point, and interface content were not designed to work together. A Paletide theme on macOS has three independent artwork slots, and understanding their roles matters more than simply chasing the highest possible resolution.

Paletide is an independent third-party tool and is not an official OpenAI product. It does not rewrite the official .app, app.asar, or code signature. Custom images are used only as local theme artwork.

Prepare source images at these recommended dimensions:

Artwork slot Recommended size Suitable content
Home hero 2400 x 600 Wide landscapes, abstract illustrations, or one clear subject
Home background 1920 x 1200 Low-contrast environmental art, texture, or spacious composition
Task-page background 1920 x 1200 Quiet artwork that does not compete with long-form reading

The hero source has a 4:1 ratio, while the actual hero container may be closer to 5.6:1. Paletide uses cover-style fitting, so some of the upper and lower edges will still be cropped. A 2400 x 600 source provides adjustment room; it does not mean every source pixel will remain visible. The home and task backgrounds use 16:10, which suits common Mac window shapes, but their edges will also be cropped as the user changes the window ratio.

Reserve a safe area for interface content

Project names, suggestion cards, and input areas in the workspace are often concentrated on the left or near the center. When composing artwork, keep roughly half of the left side calm and low contrast. Place the main subject around the middle-right and keep it at least about 8 percent away from the edges. This gives the subject a better chance of surviving a narrow window and prevents text from landing on dense detail.

A background should not contain its own window chrome, buttons, chat bubbles, or large blocks of readable text. Those elements overlap the real interface and can make an image element look interactive when it is not. Watermarks, logos, and tiny but extremely bright highlights also pull attention away from the task. More reliable artwork usually has one visual center, with the remaining space transitioning through gentle light, haze, or restrained texture.

Adjust the crop focus in Paletide

After you select an image for the first time, Paletide fills all three slots with it to provide a quick preview. You can then replace the image in each slot separately. Switch between the home and task previews, and drag the image inside each proportional crop editor until the area you most want to retain sits inside the visible frame. Hero artwork generally needs attention to its horizontal placement and vertical margin, while a 16:10 background should be checked on all four sides.

This process does not actually cut the source file. Paletide stores normalized focus coordinates and calculates the cover region for the current window size during rendering. As a result, the same theme may reveal different edges in differently sized windows, but the original image remains intact. Do not push a subject against the edge just to perfect one screenshot. Recheck it in wide, narrow, and full-screen windows.

Resolution, formats, and file limits

Standard PNG, JPEG, HEIC, TIFF, and WebP files that macOS can read are valid sources. A high-quality JPEG is usually appropriate for photography, while PNG is useful for transparent or graphic artwork. Avoid creating files far larger than the display needs simply to preserve a lossless format.

The current processing limits are specific: each source image must be no larger than 50 MB; each prepared image must be no larger than 16 MB; and the three unique prepared images must total no more than 32 MB. Neither dimension may exceed 16,384 pixels, and an image may contain no more than 50 megapixels.

If an image fails to import, export it as a standard RGB JPEG or PNG and resize it to the recommended dimensions. Very large phone panoramas, files with unusual color profiles, and images that exist only as cloud placeholders tend to cause more problems than ordinary local files.

Balance brightness and readability

A dark appearance does not require a black background, and a light appearance does not require a washed-out image. What matters is local contrast and texture density around the text. Start by reducing saturation and contrast slightly, then read several long passages on a real task page before deciding whether the artwork needs more adjustment.

Paletide estimates brightness, accent color, visual focus, and safe areas locally on the Mac. Automatic analysis is only a starting point, however. The final test is always the reading experience inside the actual interface.

Check usage rights before importing artwork

Artwork imported by a user does not automatically gain a commercial-use or redistribution license. Even for personal use, avoid public-figure photographs, film or animation characters, brand marks, and signatures from unclear sources. If you plan to share a theme pack, retain evidence of authorship or permission. Paletide does not add custom images to the bundled-asset license and cannot determine copyright clearance for the user.

The most durable theme is rarely the most attention-grabbing one. It is the theme that keeps text readable, preserves the subject across window sizes, and lets attention return naturally to the task. Compose each of the three slots for its own role, then make modest adjustments with the draggable focus. That is more reliable than forcing one image to serve every part of the interface.