When a Photoshop brush makes a subject disappear instead of adding color, inspect the active thumbnail in the Layers panel. You may be painting the layer mask. The mask changes visibility, while the image thumbnail represents the layer's pixels. A correct cutout can still look damaged when the wrong editing target receives a stroke.
Read the target before changing the brush
Select the intended layer and inspect both thumbnails. A layer with a mask has an image thumbnail and a separate mask thumbnail. Check the selection border rather than assuming that clicking the layer name selected image pixels. Photoshop's mask-editing workflow uses grayscale values, so an unexpected grayscale foreground is another reason to inspect the target.
Do not compensate immediately with brighter colors, stronger opacity or a new background-removal operation. Those changes can conceal the original mistake and create additional edits. Keep the existing document, preserve the source photo, and make the diagnosis on a duplicate or after a reversible undo.
Compare the two thumbnails deliberately
This is a reproducible test plan, not an observed result. Use a copy containing a visible subject and a layer mask. Select the mask thumbnail and make one small black stroke in a noncritical area. Note whether the image becomes hidden and whether the mask thumbnail changes. Undo the stroke before proceeding.
Select the image thumbnail, confirm its active border, then make one small colored stroke. This comparison isolates the target variable. If pixels now change color while the mask stays unchanged, the earlier behavior is consistent with editing the mask. If neither stroke has an effect, check locks, selection boundaries and the tool before claiming the target diagnosis is proven.
Restore the right component
For a mistaken mask stroke, undo it or restore the relevant visibility within the mask. Do not paint a replacement face onto the image to fill a hole caused by the mask. Conversely, changing a mask cannot remove a colored mark that was actually painted into image pixels; that requires an image-level correction or restoration from the untouched layer.
The distinction matters for a shop portrait. A black stroke may merely hide the collar and reveal a dark background below. Recreating the collar with AI would alter clothing that was never missing from the underlying photo. Inspect the original pixels with the mask temporarily reviewed before deciding that new content is needed.
Define an acceptance check
The working copy passes when the intended pixels remain present, the mask hides only the approved area, and the active thumbnail is documented before the next edit. Compare the subject edge and an interior area, not just a small thumbnail. Save a layered master and reopen it to confirm that the image and mask remain separate components.
These controls belong to desktop Photoshop. Imagild's current local editing controls should be judged separately. A semantic person or sky region is not proof that the external Photoshop mask thumbnail is active, and this guide does not promise matching controls in Imagild.