The Eraser can be used to get rid of regions of color in the current layer or from an array of this layer. When the Eraser can be used on something that doesn’t support transparency (a variety mask funnel, a layer mask, or even the Background layer whether it lacks an alpha funnel), then erasing can have the backdrop color, as displayed within the Color Part of the Toolbox (in situation of the mask, the choice is going to be modified). Otherwise, erasing will produce either partial or full transparency, with respect to the settings for that tool options. Discover more regarding how to add an alpha funnel to some layer in Section 7.33, “Add Alpha Channel”.
Figure 14.82. Eraser and Alpha funnel
The Backdrop Color is White-colored. The look doesn’t have Alpha funnel. The Eraser (Opacity 100%) shows the BG color.
The look comes with an Alpha funnel. The Eraser shows transparency.
If you want to erase some number of pixels completely, departing no trace behind of the previous contents, you can examine the “Hard edge” box within the Tool Options. Otherwise, sub-pixel brush placement may cause partial erasure in the edges from the brush-stroke, even though you make use of a hard-edged brush.
If you are using GIMP having a tablet, it may seem easy to treat overturn finish from the stylus being an eraser. To make this happen, all that you should do is click on the reverse finish around the Eraser tool within the Toolbox. Because each finish from the stylus is treated like a separate input device, and every input device features its own separate tool assignment, overturn finish will still work as an Eraser as lengthy while you don’t pick a different tool by using it.
3.9.1. Activating the tool
You are able to activate it often:
In the image menu through Tools → Paint Tools → Eraser
in the Toolbox by hitting the tool icon
or in the keyboard while using shortcut Shift + E .
3.9.2. Key modifiers
Begin to see the Section 3.1, “Common Features” for any description of key modifiers that have a similar impact on all paint tools.
For that Eraser, holding lower the Ctrl key puts it into “ color picker ” mode, in order that it selects the colour associated with a pixel it’s visited. Unlike other brush tools, however, the Eraser sets the background color as opposed to the foreground color. This really is more helpful, because on drawables that do not support transparency, erasing replaces the erased areas using the current background color.
For that Eraser, holding lower the Alt key switches it into “ anti-erase ” mode, as described below within the Tool Options section. Observe that on some systems, the Alt secret is trapped through the Window Manager. Should this happen for you, you might be able to use Alt + Shift rather.
3.9.3. Tool Options
Figure 14.83. Tool Choices for the Eraser tool
Normally, tool choices are displayed inside a window attached underneath the Toolbox once you activate something. If they’re not, you have access to them in the image menu bar through Home windows → Dockable Home windows → Tool Options which opens the choice window from the selected tool.
The Opacity slider, regardless of its name, within this tool determines the “ strength ” from the tool. Thus, whenever you erase on the layer by having an alpha funnel, the greater the opacity you utilize, the greater transparency you receive!
This method avoids partial erasure in the edges from the brush-stroke. See above.
The Anti Erase choice of the Erase tool can united nations-erase regions of a picture, even if they’re completely transparent. This selection only works when utilized on layers by having an alpha funnel. Additionally towards the check-button within the Tool Options, it is also activated on-the-fly by holding lower the Alt key (or, when the Alt secret is trapped through the Window Manager, by holding lower Alt + Shift ).
To know how anti-erasing can be done, you need to understand that erasing (or cutting, for instance) only affects the alpha funnel, and not the RGB channels which contain the look data. Whether or not the outcome is completely transparent, the RGB data remains, you can’t simply view it. Anti-erasing boosts the alpha value to be able to begin to see the RGB data once more.
You should use the Eraser tool to alter the form of the floating selection. By erasing, you are able to trim the perimeters from the selection.