PhotoScissors for Mac is an intelligent tool focused on quickly removing image backgrounds. It uses interactive foreground and background marking technology, allowing users to efficiently separate subjects from backgrounds without complex manual path tracing. This guide will detail its interface, complete workflow, and practical tips.

I. Detailed Explanation of the Core Interface and Workspace

After launching the software, the main interface is primarily divided into five functional areas:

Top Menu Bar and Toolbar: Contains main menus such as File operations, Edit, and View. The toolbar below provides core tool buttons, such as “Foreground Brush (Red),” “Background Brush (Green),” “Zoom Tool,” and “Hand Tool.”
Left Tool Panel: Vertically arranges the main operation tools.
- Foreground (Red Brush): Used to mark the parts of the object that should be kept.
- Background (Green Brush): Used to mark the background parts that should be removed.
- Eraser: Erases incorrect markings.
- Zoom and Hand: Used for navigating and viewing image details.
Central Canvas Workspace: Displays the image currently being edited. Markings and cutout results are previewed here in real time.
Right Parameter Panel:
- Brush Size Slider: Quickly adjusts the diameter of the marking brush.
- Selection Optimization Options: such as “Smooth Edges,” “Edge Shift,” etc., used to fine-tune the quality of the selection edges.
- Background Replacement/Preview: Here you can choose a solid color, transparency, or a new image as the background to preview the effect.
Bottom Status Bar: Displays information such as the current image zoom ratio and operation hints.

II. Complete Workflow: From Opening to Exporting

Step 1: Create/Open a Project

After launching the software, you can load an image in any of the following ways:

Click the menu bar “File” > “Open…” (shortcut Cmd + O).
Drag and drop the image file directly into the central canvas area of the software.

Step 2: Roughly Mark the Foreground and Background

In the left toolbar, select the “Foreground Brush” (red).
Roughly paint over the main subject of the image (the part you want to keep). No need for precise outlining; simply covering the interior area of the subject is sufficient.
Switch to the “Background Brush” (green).
Roughly paint over the background areas you want to remove. The software will calculate in real time to distinguish between the subject and the background.
Tip: For complex edges (such as hair), you can use a smaller brush at the boundary (press [ to shrink and ] to enlarge the brush) for detailed marking.

Step 3: Optimize and Fine-Tune the Selection

After the initial marking, the software will automatically generate a mask. At this point, you need to check and optimize:

Zoom in to inspect: Use Cmd + + to zoom in the view, and use the Hand tool (hold the spacebar and drag) to move the canvas.
Correct mistakes: If part of the background is mistakenly identified as the subject, use the green brush to mark over it; conversely, use the red brush. You can use the Eraser tool to clear incorrect marks.
Adjust edge parameters: In the right panel, adjust the “Smooth” and “Edge Shift” sliders as appropriate to make the subject’s edges look more natural.

Step 4: Preview and Background Processing

In the “Background” section of the right panel, you can:

Select “Transparent” to preview the transparent background effect with a checkerboard pattern.
Select “Color” and click a color swatch to change to any background color for comparison.
Select “Image” to load another image as a new background to preview the composite result.

Step 5: Export the Final Result

Once you are satisfied with the cutout result:

Click the menu bar “File” > “Export…” (shortcut Cmd + E).
In the pop-up dialog:
- Choose the save location and file name.
- Select the file format: PNG (supports transparent backgrounds) or JPG is recommended.
- Set the image quality (e.g., when JPG is selected).
Click “Save” to complete the export.

III. Advanced Tips for Common Features

Quick brush switching: Press R to switch to the foreground (red) brush, press B to switch to the background (green) brush, and press E to switch to the eraser. This can greatly improve marking efficiency.
Smart brush size adjustment: In addition to using the slider, you can use the shortcuts [ and ] directly on the canvas to shrink or enlarge the brush size more quickly.
Use “Edge Offset” to handle hair: For semi-transparent edges such as hair, appropriately increasing the “Edge Offset” value in the right panel allows the software to include more edge details during calculation, avoiding a harsh cutout look.
Undo and redo: Any mistaken operation can be undone with Cmd + Z and redone with Cmd + Shift + Z.
One-key preview of the original image: When checking the cutout effect, hold down the Tab key to temporarily hide all marker lines and view the original cutout result; release it to restore the marker display.

IV. Common Issues and Solutions

Issue 1: The cutout edges have residual background color or look harsh.

Solution: First, make sure you have made sufficiently detailed red and green markings at the boundary between the subject and the background. Then, try increasing the “Smooth” value in the right panel and fine-tune the “Edge Shift” value. For areas with similar colors, you may need to use a smaller brush and mark multiple times.

Issue 2: After marking, the software does not correctly distinguish between the foreground and background.

Solution: Check whether your markings are clear enough. Foreground (red) markings should be entirely inside the subject, and background (green) markings should be entirely in the background area. Avoid overlapping markings or drawing beyond the boundary. You can try clearing (using the eraser) and then using a larger brush to make clearer area markings.

Issue 3: The software responds slowly when processing high-resolution images.

Solution: During the initial marking stage, you can first use a larger brush to quickly complete large-area marking. When making detailed fine-tuning, zoom in to local areas for operations, avoiding working at full size the entire time and consuming too many resources.

Issue 4: After exporting as PNG, the background is not transparent.

Solution: Make sure that before exporting, you have selected the “Transparent” option in the right-side background panel for preview. When you select the PNG format in the export dialog, the software will automatically preserve the Alpha transparency channel.

V. PhotoScissors for Mac Keyboard Shortcuts Summary Table

Function	Shortcut (Mac)	Description
Open File	`Cmd + O`	Open an image for editing
Export Image	`Cmd + E`	Export the processed image
Undo	`Cmd + Z`	Undo the previous operation
Redo	`Cmd + Shift + Z`	Restore the undone operation
Switch to Foreground Brush	`R`	Select the red marker brush
Switch to Background Brush	`B`	Select the green marker brush
Switch to Eraser	`E`	Select the eraser tool
Zoom In	`Cmd + +` or `Cmd + Mouse Scroll Up`	Enlarge the canvas to view details
Zoom Out	`Cmd + -` or `Cmd + Mouse Scroll Down`	Shrink the canvas to view the whole picture
Actual Size	`Cmd + 0`	View the image at 100% scale
Fit to Screen	`Cmd + 9`	Scale the image to fit the window
Hand Tool (Temporary)	Hold Spacebar and Drag	Move the canvas while zoomed in
Decrease Brush Size	`[`	Quickly shrink the current brush
Increase Brush Size	`]`	Quickly enlarge the current brush
Temporarily Hide Markers	`Tab`	Hold to hide all marker lines and preview the cutout result