From Image and image profiles

Choose an image, then use its numbered markers to refine the extracted colors. Select a swatch or its matching marker and click or tap the image to replace that color. Drag the marker to sample continuously with a magnifying loupe; dragging outside a marker pans the image instead.

Controls by platform

Mac

• Choose or drop an image file. Over the image, scroll the mouse wheel or trackpad to zoom around the pointer; hold Shift while scrolling to change zoom in 10-percentage-point steps (for example, 100% → 110%). You can also pinch the trackpad or use the − and + zoom buttons.
• Drag outside a marker to pan. Click the zoom percentage or Fit Image to fit and recenter the image. Here, 100% means fit to the available area, not one image pixel per screen pixel.

iPhone and iPad

• Choose an image file, take a photo, or share an image to Huebook from another app. Pinch with two fingers or use the − and + zoom buttons. Drag outside a marker to pan; drag a marker to sample its color.
• Tap the zoom percentage or Fit Image to fit and recenter the image. Here, 100% means fit to the available area. With VoiceOver, use Pick center color on the image or a marker’s directional actions to move it one image pixel at a time.

Use + to add a swatch without replacing the others, or the trash button to remove one. Choose Original for dominant image colors or a harmony to find the closest colors available in the image. Save as Palette stores the result; Open in Generator lets you refine it further.

The image starts fitted to the available area. Zoom ranges from 75% to 800% of that fitted view. You can keep up to ten swatches; + is unavailable when there are no unused extracted colors left.

An image color profile describes how the RGB numbers in an image correspond to visible colors. Huebook reads the image’s embedded profile when available. Image Profile selects the working/output space: sRGB is the common default for screens and web, while Display P3 can represent a wider range of colors on supported displays. Choosing another profile reloads the image and recalculates its extracted colors.

A custom RGB ICC profile applies only during the current image import session. Huebook validates it and converts the image into sRGB or Display P3. Saved colors retain their standard-space and extended color data when available; WCAG contrast and SDR-only formats use a bounded sRGB version. HDR images can contain brighter highlights than SDR. Choose an HDR-capable export to retain that range; appearance depends on the display and the receiving app. For HDR extraction, choose the standard sRGB or Display P3 option rather than a custom ICC profile, whose intermediate conversion reduces the available range.