Photoshop · Lesson 10 The Brush Tool
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Photoshop · Lesson 10
One Tool.
Infinite Possibilities.
The Brush tool is the engine behind almost every workflow in Photoshop — masking, retouching, dodging, burning, painting. Master this one tool and the whole application opens up.
🎭
Masking
Paint on layer masks to reveal and hide with total precision.
✨
Retouching
Clone, heal, dodge, and burn — all run through the same brush engine.
🎨
Painting
From vignettes to digital art. The brush connects photography and illustration.
🖌️ If you could keep only one Photoshop tool, the Brush would be the right answer — because it powers everything else.
Fundamentals
Brush Basics
B Activate
[ ] Resize
Shift+[ ] Hardness
1–9 Opacity
Shift+1–9 Flow
B
Activate Instantly
Press B every time. Never click the toolbar. Keyboard shortcuts are non-negotiable in a pro workflow.
[ ]
Resize On the Fly
Left bracket shrinks. Right bracket grows. Never go back to the Options bar to resize — this is the pro way.
H
Hardness: 0% vs 100%
0% = soft feathered edge (masking, vignettes). 100% = crisp hard edge (graphic work). Photographers live at 0%.
RMB
Right-Click Pop-Up
Right-click on canvas with the brush active for an instant size/hardness picker — fastest way to dial both at once.
🎯 Learn B, [ ], and Shift+[ ] right now. These three shortcuts alone make you faster than most people using Photoshop.
Deep Dive
Opacity vs Flow
The most misunderstood settings on the Options bar — they look similar but do completely different things.
🔒
Opacity — The Ceiling
Sets the maximum density of an entire stroke. At 50% opacity, no matter how many times you paint over the same spot in one stroke, the result caps at 50%. It is a hard limit.
💧
Flow — The Rate
Controls how quickly paint builds up. At 10% flow, each pass adds a little more. Paint back and forth and it gradually builds to full density — like a real airbrush.
💡
The Photographer's Sweet Spot
For mask painting and dodge/burn: set Opacity to 100%, Flow to 10–20%. This lets you build up gradually, giving far more control than one heavy pass. Go slow, build up, refine.
🔑 Opacity = ceiling. Flow = rate. Low flow, high opacity is the professional masking setting. Memorize it.
Tools
Brush Presets Panel
Window → Brush Presets. Hundreds of brushes ready to go — and you can save your own.
⭕
Soft Round
The workhorse. Hardness 0%, perfectly round. Covers 90% of masking and retouching. Your default brush.
🔵
Hard Round
Hardness 100%, crisp edge. Used for graphic design, hard-edged masks, and precise linework.
🎨
Kyle Webster
World-class brush packs included free with Creative Cloud. Watercolor, oil, pencil — for photographers exploring illustration.
💾
Save Your Own Presets
Dial in your brush — size, hardness, flow — then open the Brush Presets panel menu and choose New Brush Preset. Name it descriptively: "Masking Soft 200px". It'll be waiting for you every session.
⭐ Soft round and hard round cover 95% of everything photographers do. Know those two first, then explore.
Core Technique
Painting on Masks
Black hides. White reveals. The fundamental rule of layer masking.
⬛
Black = Hide
Painting black makes those pixels transparent. Remove a sky, clean up a background, refine a rough edge.
⬜
White = Reveal
Painting white brings pixels back. Hidden too much? Press X to swap to white and paint it back. Nothing is ever destroyed.
1
Click the Mask Thumbnail
In the Layers panel, click the white mask thumbnail — not the image thumbnail. This targets the mask for painting.
2
Press D then X
D resets foreground/background to Black/White. X swaps between them. This is your on/off switch for masking.
3
Soft brush for organic edges, hard brush for geometric
Hair, skin, clothing = soft brush. Glass, metal, product = hard brush. Match your brush edge to your subject's edge quality.
✂️ X is your undo key in masking mode. Made a mistake? Don't reach for Ctrl+Z — just press X and paint it back.
Pro Technique
Non-Destructive
Dodge & Burn
The 50% gray Overlay layer — the technique professional retouchers use on every portrait.
1
New Layer Above Your Image
All your dodge and burn information lives here — completely separate from the photo.
2
Fill with 50% Gray — Edit → Fill
Set Contents to 50% Gray. The layer looks gray now — that's expected. This neutral gray will become invisible in the next step.
3
Set Blending Mode to Overlay
Change the layer mode from Normal to Overlay. The gray disappears — it's now invisible. Only values lighter or darker than 50% will affect the image below.
4
Paint White to Dodge, Black to Burn
Opacity 100%, Flow 10–15%, soft round brush. Paint white on highlights, eyes, catchlights. Paint black to deepen shadows. Work slowly and build up.
🔮 Because it's a separate layer, you can lower its opacity, erase mistakes, or delete it entirely — your original photo is completely untouched.
Creative Technique
Color Overlay
Change colors non-destructively using a layer in Color blending mode. The texture of the original is always preserved.
1
New Layer → Set to Color Mode
The Color blending mode affects only hue and saturation — it leaves all the luminosity (light and dark values) of the original image completely alone.
2
Pick a Color, Start at 30–50% Opacity
You can always build up, but a heavy first pass looks cartoonish. The original texture shows through beautifully when opacity is right.
3
Paint and Adjust
Change the foreground color and paint again to try another color. Erase and start fresh without touching the original image.
🌅
Sky Color Shift
Paint a warm golden tone over a flat blue sky. All the cloud detail is preserved — only the color changes.
👕
Wardrobe Changes
Client wants a different jacket color? Two minutes with this technique, completely non-destructive.
🎨 Color mode is the secret to convincing color changes — because all the original texture and detail shows through.
Quick Win
Painting Vignettes
A classic photographic vignette draws the eye to your subject. This technique takes under 30 seconds once it's in your muscle memory.
1
New Layer + Elliptical Marquee (M)
Draw an oval selection centered on your canvas, roughly following the frame of your subject. It should cover most of the image area.
2
Invert — Shift+Ctrl/Cmd+I
Now the edges are selected, not the center. You have a frame selection that protects the subject and targets the outer areas.
3
Feather 80–150px
Right-click inside the selection → Feather. This creates the soft gradual fade that makes a vignette look photographic. Without feathering you get a hard ugly ring.
4
Fill Black → Reduce Layer Opacity to 30–50%
Edit → Fill with black. Adjust the layer opacity for subtlety or drama. Deselect with Ctrl/Cmd+D. Done.
⚡ Because this is a separate layer, you can move, adjust, or delete the vignette at any time. I put this on nearly every portrait and landscape I finish.
Technique
Flow & Airbrush Mode
There's a hidden button in the Options bar that changes how flow works — and most people never find it.
🖱️
Standard Flow
Paint only builds up when you move the cursor. Holding still in one spot adds no more paint — it's tied to movement.
💨
Airbrush Mode
Click the airbrush icon in the Options bar (or Alt+Shift+P). Holding still continues to pump paint. More time = more buildup. Exactly like a real aerosol can.
🎯
When to Use Airbrush Mode
Perfect for soft glows, gradual color buildups, and subtle effects. Set Flow to 5–10%, turn on Airbrush, hover over a spot, count to three — you get a perfectly placed, softly building touch of paint that's almost impossible to achieve any other way.
💨 Try it: Flow 8%, Airbrush on, hover over one spot for 5 seconds. Watch the paint build slowly and perfectly in place.
Advanced Preview
Brush Dynamics
Window → Brush Settings. This is where the brush becomes fully responsive to pen pressure, tilt, and speed — the world of graphics tablet users.
📐
Shape Dynamics
Controls how brush size, angle, and roundness vary as you paint. Pen pressure can taper each stroke naturally.
✨
Scattering
Spreads brush marks away from the stroke path — great for sparkle effects, texture painting, and organic strokes.
💧
Transfer
Links opacity and flow to pen pressure. Light pressure = transparent. Heavy pressure = solid. Makes brushwork feel natural.
🖊️
Wacom or iPad — This is Where It Pays Off
If you own a Wacom, Huion, or use an iPad with Sidecar, Brush Dynamics is where your investment multiplies. Pressure-sensitive masking and retouching feels completely natural — like painting with a real brush. For portrait retouchers, it's transformative.
🖊️ We won't go deep on Dynamics today — it's its own lesson. But now you know it exists, and where to find it when you're ready.
Recap
What We Covered Today
[ ]
Size & Hardness
Bracket keys resize. Hardness = edge quality. Match your brush edge to your subject's edge.
F
Low Flow for Masks
Flow 10–20%, Opacity 100%. Build up gradually. Never one heavy pass.
D&B
50% Gray Overlay
New layer → 50% gray → Overlay mode. White = dodge, black = burn. Fully non-destructive.
Check each item you can do right now:
Resize and adjust hardness using only keyboard shortcuts
Explain the difference between Opacity and Flow
Paint on a layer mask using Black/White and X to swap
Set up a 50% gray Overlay layer for dodge and burn
Create a vignette layer in under 30 seconds
Your Challenge
Practice Assignment
Take any portrait or landscape from this week. Apply both of these techniques before the next session.
1
Add a Vignette Layer
Elliptical Marquee → invert → feather 100px → fill black → reduce opacity. Time yourself. Aim for under 30 seconds.
2
Add a Dodge & Burn Layer
50% gray → Overlay → paint white on highlights, black on shadows. Use Flow 10–15% and take it slow. Compare your before/after.
3
Bonus: Refine a Mask
Take any selection you've made before and refine its edges using the brush on a layer mask. Practice switching X between black and white.
4
Bonus: Try Color Mode
Pick a sky or a piece of clothing. Create a Color-mode layer and change its color. Notice how the texture is preserved.
🎯 If you only do one thing: apply the 50% gray Overlay D&B layer to your very next photo. This technique alone will change your edits.
Up Next
Lesson PS-11 — Photoshop
Camera Raw Filter:
Lightroom Power Inside Photoshop
What if Lightroom's entire Develop module — every slider, the tone curve, HSL, masking — was available inside Photoshop on any layer, any time, and re-editable forever? It is. That's Camera Raw Filter, and it changes everything about how you finish a photo.
Smart Objects Re-editable Filters Full Develop Engine
Next Lesson →
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