Layer Blend Modes for Shading, Explained
For shading, four layer blend modes cover almost everything. Multiply darkens and holds the surface hue, so it carries shadow. Screen lightens gently for soft light and glow. Add lightens hard for the few hottest highlights. Overlay pushes contrast and temperature to unify the image. Stack them above your flats in that order, each at its own opacity.
Blend modes look like a long intimidating list, but for shading you only need four, and each has one clear job. Once you know which of the layer blend modes does what, you stop guessing and start placing light and shadow deliberately, and you can change your mind about the light without repainting a single flat. This tutorial gives the four modes, a worked layer stack with opacities and colors, the order to build it, and the fixes when a mode misbehaves, and it sits in the digital painting fundamentals pillar, and it assumes the values in painting already read in greyscale; modes refine a value structure, they do not create one.
Multiply is for shadow
A layer set to Multiply darkens everything beneath it and never lightens. That makes it the natural home for shadow. Paint your shadow shapes in a mid neutral or a slightly cool color on a Multiply layer above your flats, and they sink into the base color without turning muddy. Lower the opacity to soften the whole shadow pass at once.
Multiply multiplies the color values together, so a shadow painted this way keeps the hue of the surface underneath instead of covering it with grey. That is why Multiply shadows look like shadow and grey paint on a Normal layer looks like dirt.
Color choice matters more than most tutorials admit. A pure grey on Multiply desaturates the surface; a shadow color with a little hue in it, such as a dull violet over warm skin or a dull blue over green cloth, keeps the shadow alive. Start around 40 percent lightness and 20 to 30 percent saturation and adjust from there. Two Multiply layers stacked read as two depths of shadow: a broad form shadow at 50 to 60 percent opacity, and a small occlusion pass at 70 to 80 where surfaces touch.
Screen and Add are for light
Screen is the opposite of Multiply: it only lightens, and it lightens gently because it can never push past white in one step. Use it for soft direct light, rim light, glow and atmosphere. Add (called Linear Dodge in Photoshop and Clip Studio) is Screen with the volume turned up; it sums the values and blows toward white fast, so reserve it for the hottest highlights, a lamp filament, a spark, the sun catching an edge. A little goes a long way, and on a dark base it will clip to pure white before you expect it to.
The W3C Compositing and Blending specification gives the exact formulas: Screen is 1 minus (1 minus base) times (1 minus blend), so the result approaches white without reaching it, while Add is a plain sum that clips. That single difference is the whole reason Screen is the everyday light layer and Add is the accent.
Overlay is for pushing color and contrast
Overlay darkens the darks and lightens the lights at once, using the value beneath to decide which. It is how you unify a painting: drop a warm color over the lit areas and a cool color into the shadows on one Overlay layer, and the whole image reads as sitting in a single light. Keep the opacity low, 20 to 30 percent to start; Overlay is strong, and at full strength it crushes the mid values you spent the block-in protecting. Soft Light is a gentler Overlay for when even 20 percent is too much.
A worked layer stack for shading
This is the stack used on the plate above, from the bottom up. Every layer above the flats is clipped to them so nothing spills outside the silhouette. Opacities are starting points; the color column names the kind of color, since the exact hue depends on your palette.
| Layer (bottom to top) | Mode | Opacity | Color | Job |
|---|---|---|---|---|
| 01 Flats | Normal | 100 | Local color of each surface, mid value | The base every mode reads from |
| 02 Shadow | Multiply | 50 to 60 | Dull, slightly cool mid-tone (about 40 percent lightness) | Form shadow: one soft shape per object |
| 03 Occlusion | Multiply | 70 to 80 | Same hue as Shadow, darker | Small dark accents where surfaces touch |
| 04 Light | Screen | 30 to 50 | Pale warm color, never white | Direct light on the lit planes, rim light |
| 05 Highlight | Add | 20 to 40 | Warm near-white | Two or three hottest spots only |
| 06 Bounce | Screen or Normal | 15 to 25 | Color of the nearby surface or ground | Reflected light inside the shadow side |
| 07 Unify | Overlay | 20 to 30 | Warm over light, cool over shadow | Pulls the whole image into one light |
| 08 Adjust | Normal | 30 to 50 | Sampled from the painting | Hand fixes for anything the modes got wrong |
Numbering the layers is part of the method, not decoration. When a client or a critique asks how a piece was made, a stack that reads 01 Flats through 08 Adjust is a process record in itself. The documenting your art process tutorial covers keeping that layered file alongside roughs and a timelapse so the shading order is provable later.
The order to build shadow, light, bounce and color
Build in this sequence and you can change your mind about the light at any stage without repainting, because each decision lives on its own layer. A highlight placed before the shadow shape exists nearly always lands in the wrong spot.
Flats first, and check them in greyscale
Lay the local colors on 01 Flats at their mid value. Toggle a black Color layer on top: the flats alone should already separate as shapes. If they do not, fix the values now; no mode will rescue them.
Shadow shape on Multiply
On 02 Shadow, paint one soft shadow shape per object with a hard-ish brush, then soften only the terminator. Decide the light direction here and do not move it later. Add 03 Occlusion last, small and dark.
Light on Screen, then the accent on Add
On 04 Light, paint the lit planes with a pale warm color at 30 to 50 percent. Only when that reads, add two or three Add highlights at 20 to 40 percent on 05 Highlight. If you need more than three, the Screen layer is too weak.
Bounce into the shadow
On 06 Bounce, feather a little of the ground or nearby surface color into the shadow side, away from the occlusion. This is what stops the shadow reading as a flat cut-out.
Unify with Overlay, then hand-fix
On 07 Unify at 20 to 30 percent, warm over the light and cool over the shadow with a large soft brush. Finish on 08 Adjust with sampled colors for any edge or transition the modes could not handle; hard and soft edges are decided here.
Move the light source by repainting 02 Shadow and 04 Light only. The flats, occlusion, bounce and unify layers usually survive with small edits. That is the whole payoff of keeping every decision on its own mode.
Where the modes live, and what they are called
The four modes exist in every major painting app. Photoshop lists Add as Linear Dodge (Add) and Adobe's blending mode descriptions page defines each in plain words. Procreate keeps them under the N badge on each layer, as described in the Procreate Handbook's blend modes page. The Krita Manual's blending modes reference groups them by family, Darken, Lighten and Mix, which is a useful habit to borrow. The layer modes cheat sheet lists the names side by side across apps.
Troubleshooting: when a mode misbehaves
| Problem | Cause | Fix |
|---|---|---|
| Multiply shadows look grey and dead | Shadow color is a pure grey or black | Use a dull hue at about 40 percent lightness; try cool over warm surfaces |
| Multiply shadows are too dark on dark surfaces | Multiply compounds with an already dark flat | Lower the layer to 30 to 40 percent on dark objects, or paint the shadow lighter |
| Add highlights blow out to flat white | Add sums and clips; the color was too light | Drop to 20 percent, paint with a warm mid-light instead of white, or switch to Screen |
| Screen light looks chalky | The light color is desaturated or near white | Use a saturated pale color; Screen lifts value on its own |
| Overlay crushes the mid values | Opacity too high, or the Overlay color is too dark or too light | Drop to 20 percent; keep Overlay colors near mid value; try Soft Light |
| Modes spill outside the object | Layers are not clipped to the flats | Clip every shading layer to 01 Flats |
Layer blend modes for shading, in short
Multiply for shadow, Screen for light, Add for the two or three hottest spots, Overlay at low opacity to unify, and a numbered stack built in that order over flats that already read in greyscale. That is all the layer blend modes for shading you need for most work. For the same modes laid out as a one page table with names across apps, keep the layer modes cheat sheet open while you paint.
Common questions
What blend mode is best for shading?
Multiply, because it only darkens and keeps the hue of the surface beneath it, so shadows painted on a Multiply layer look like shadow instead of grey paint. Use a dull, slightly cool color at around 40 percent lightness and 50 to 60 percent layer opacity, then add a second, darker Multiply layer for small occlusion where surfaces touch.
Should I use Screen or Overlay for lighting?
Screen for the light itself: it lightens without pushing contrast, so lit planes and rim light stay clean. Overlay for the final unifying pass at 20 to 30 percent, where it warms the lights and cools the shadows at once. Add is for the two or three hottest highlights only, because it clips to white quickly.
What is the difference between Add and Linear Dodge?
They are the same mode under two names. Photoshop and Clip Studio call it Linear Dodge (Add); Procreate and Krita call it Add or Addition. It sums the layer and base values and clips at white, which is why it is brighter and harsher than Screen and should be kept to small highlights at low opacity.
Why do my Multiply shadows look muddy?
Almost always because the shadow color is a neutral grey or black, which strips saturation from the surface, or because the flats beneath have no value separation to begin with. Repaint the shadow with a dull hue that has some color in it, check the flats in greyscale, and lower the layer opacity to 50 percent.
Sources and further reading
Primary references for the facts and definitions in this piece, all from independent publishers:
- W3C: Compositing and Blending Level 1: the formal definitions of Multiply, Screen, Overlay and the other blend modes.
- Krita Manual: Blending modes: how the modes behave inside a painting app.
- Procreate Handbook: Blend modes: where the modes live in a tablet painting app.
- Adobe: Blending mode descriptions in Photoshop: photoshop's plain-language definition of each mode, including linear dodge (add).
This method is part of the digital painting fundamentals pillar. Pair it with Blend Modes Cheat Sheet for Digital Painting and Values in Painting: Why Your Color Looks Off. Keep the printable blend mode reference open while you paint.