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What does Dissolve do in Photoshop?
Adobe describes Dissolve as randomly replacing pixels with the base color or the blend color, depending on opacity. The base color is what lies underneath; the blend color is what the layer or painting operation applies. At reduced opacity, fewer pixels are replaced, rather than every pixel becoming a smooth mixture of the two colors. That random distribution explains the scattered or grainy appearance; by itself, it does not indicate a defect.
For Adobe’s definition and its notes on mode availability, see Blending mode descriptions in Photoshop.
How to use Dissolve on a layer
- In the Layers panel, select the layer or group you want to affect.
- Open the Blend Mode menu and choose Dissolve.
- Adjust the layer’s Opacity and preview the result. Changing opacity changes the proportion of pixels replaced.
Adobe documents layer opacity and blending controls in Set layer opacity and blending modes in Photoshop. Opacity affects the layer and its effects. Fill is a separate control: it affects layer content while preserving effects such as drop shadows and strokes, so it is not simply interchangeable with Opacity.
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How to paint with Dissolve
For a supported painting tool, choose Dissolve from the tool’s Mode options, then set Opacity and Flow as needed. The tool’s Mode determines how applied color blends; Opacity controls its transparency, while Flow controls how quickly paint builds toward the opacity limit as you move the pointer. These are painting-tool controls, distinct from a layer’s Blend Mode and Opacity. Availability and exact controls depend on the selected tool.
Adobe explains these painting controls in Painting tools in Adobe Photoshop.
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Why does Dissolve look grainy or speckled?
The speckles follow from the mode’s random pixel replacement: the result consists of base-color and blend-color pixels distributed according to opacity instead of a smooth color transition at every affected pixel. Lowering opacity reduces how many pixels are replaced; it does not turn Dissolve into conventional smooth transparency.
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What to check if Dissolve behaves unexpectedly
- Confirm whether you changed the layer’s Blend Mode or the painting tool’s Mode; they control different operations.
- Check the relevant Opacity setting, since layer opacity and painting-tool opacity are separate.
- If painting, check Flow as well; it affects how quickly color builds during a stroke.
- If Dissolve is missing, check the selected tool and document’s image color mode. Adobe says available modes depend on both, and its current descriptions include Dissolve for 32-bit images. That listing does not mean every tool or workflow exposes the mode in every document.
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