With Object Subtract enabled, Photoshop will use artificial intelligence when drawing a loose rectangle or lasso around the object to be removed from the selection.Enable Enhance Edge to reduce rough edges of the selection in transitional areas.Holding Option (Mac) | Alt (Win) toggles between Add To and Subtract From. Quick Selection Tool - When using the Quick Selection tool, after clicking in the image, the tool automatically switches to the “Add To” mode making it easy to drag again with the tool to add to an existing selection. Enable “Sample All Layers” in the Options bar to sample more than one layer.To select similar colors throughout the image (as opposed to being restricted to similar pixels that are touching the originally selected area) uncheck the “Contiguous” option in the Options bar.A higher value selects a broader range of colors. A low value selects the few colors very similar to the pixel you click. Press Return key (Mac) | Enter (Win), to automatically highlight the Tolerance amount to enter a numeric value ranging from 0 to 255 (tolerance determines how similar the surrounding pixels need to be to be added to the selection.Use the Sample Size in the Options bar to select the number of pixels sampled in the image to use as the basis for selection.The Magnetic Lasso Tool Options- When using the Magnetic Lasso tool, the following shortcuts can help to quickly change tool options: Using the Marquee and Lasso tools - This video ( Using the Marquee and Lasso Tools) walks though the essentials of making selections using the Marquee tools for selecting geometric shapes, and the Lasso tools for selecting free-form shapes. Note: this edge option is also available for Select > Modify > Smooth, Expand, and Contract. When using Select >Modify > Feather, you can choose whether or not to apply the feathering along any of the edges of the image that the selection touches by enabling/disabling the “Apply Effect at Canvas Bounds” option.This video ( Five Ways to Soften the Edge of a Selection) demonstrates five different ways to feather a selection including feathering (or not) selections that touch the edge of the canvas (image area).If you prefer to leave the tool options at their default, you can add a feather after creating the selection by choosing Select > Modify > Feather (Shift + F6) and entering a value. Softening the Edge of a Selection - When using the Marquee and Lasso tools, tapping Return (Mac) | Enter (Win), will automatically highlight the Feather amount in the Options bar (adding a Feather softens the edge of the selection and is applied to the NEXT selection that you draw with the tool). Holding the Optionkey (Mac) | Alt key (Win) while dragging the Magnetic Lasso tool will toggle to the regular Lasso if you drag with the cursor and the Polygonal Lasso if you click with the cursor.Note: When starting with the Lasso tool, this shortcut might take a few tries to master as you have to be careful to release the Option/Alt key (to return from the Polygonal Lasso to the regular Lasso) while continuing to hold the mouse down. Toggling the Lasso Tools in Photoshop - Holding the Option key (Mac) | Alt key (Win) toggles the Lasso tool to the Polygonal Lasso tool and vice versa. This video ( 3, 2, 1, Ps! Seven Tips for Making Basic Selections in Photoshop) demonstrates several of the shortcuts above. Release the spacebar (while still holding the mouse down) to continue creating the selection. Repositioning the Selection while Drawing - After starting to draw a selection using a Marquee or Lasso tool, press and hold the spacebar (while still holding the mouse down), then drag to reposition the origin of the selection. Selecting a Circle or a Square - Shift -drag constrains the Rectangular Marquee tool to a square and the Elliptical Marquee tool to a circle.
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