Photoshop guide · updated September 2026
How to sharpen an image in Photoshop — and when to use AI
Smart Sharpen, Unsharp Mask and High Pass, step by step with the exact menus and starting values. Plus what to do when the photo is too blurry for any sharpening filter.
- Exact menu paths
- Starting values
- Real side-by-side
- AI option for blur
Updated by the Kenerate AI team
On this page
Quick answer
How do you sharpen an image in Photoshop?
To sharpen an image in Photoshop, choose Filter → Sharpen → Smart Sharpen, set Amount to about 100–150% and Radius to 0.5–1.5 px, pick Lens Blur under Remove and click OK. Unsharp Mask is the quicker classic. For a truly blurry photo, an AI enhancer such as Kenerate AI's Phota Enhance rebuilds detail instead.
Key facts
- Best filter
- Smart Sharpen
- Start with
- Amount 100–150% · Radius 0.5–1.5 px
- Quick classic
- Unsharp Mask
- Blurry photo?
- Use an AI enhancer
Method 1 · best
How to sharpen with Smart Sharpen
The most flexible sharpening filter in Photoshop.
Step 1: Make a smart object
Right-click the layer and choose Convert to Smart Object (or Filter → Convert for Smart Filters) so you can change the sharpening later.
FilterConvert for Smart Filters
Step 2: Open Smart Sharpen
Choose Filter → Sharpen → Smart Sharpen and zoom the preview to 100%.
FilterSharpenSmart Sharpen
Step 3: Set Amount and Radius
Start around Amount 100–150% and Radius 0.5–1.5 px. A small radius sharpens fine detail; a larger one sharpens broader edges.
Step 4: Pick what to remove and reduce noise
Set Remove to Lens Blur for finer sharpening with fewer halos (Gaussian Blur behaves like Unsharp Mask), and raise Reduce Noise until grain stops getting worse.
Tip: Lens Blur finds edges and fine detail and makes fewer halos than Gaussian Blur.
Step 5: Click OK and check at 100%
Toggle the smart filter on and off to compare. Lower Amount if you see bright halos along edges.
Method 2 · quick
How to sharpen with Unsharp Mask
The fast, traditional filter — three sliders.
Step 1: Open Unsharp Mask
Choose Filter → Sharpen → Unsharp Mask.
FilterSharpenUnsharp Mask
Step 2: Set Amount, Radius and Threshold
For web images try Amount 80–120%, Radius 0.5–1 px, Threshold 0–3 levels. Raise Threshold to protect smooth skin and sky from grain.
Step 3: Apply and compare
Click OK and compare at 100%. Undo and lower Amount if edges glow.
Method 3 · editable
How to sharpen with High Pass
A layer-based method you can paint out with a mask.
Step 1: Duplicate the layer
Press Ctrl+J (Cmd+J on Mac) to copy the layer.
Step 2: Run High Pass
Choose Filter → Other → High Pass and set a Radius of about 1–3 px, until edges just show in the grey preview.
FilterOtherHigh Pass
Step 3: Blend it in
Set the copy's blend mode to Overlay (stronger) or Soft Light (gentler) and adjust its opacity.
Side by side
Sharpening filter vs AI: what's the difference?
The same crop of a soft robin photo three ways. Unsharp Mask adds contrast to the edges it finds; the AI rebuilds feathers that the blur had merged.
- Original (soft) — The soft 900 px photo, enlarged
- Unsharp Mask — Amount 160%, Radius 2 px, Threshold 2
- AI (Phota Enhance) — Detail rebuilt in about 40 seconds
Unsharp Mask applied with the standard algorithm at the settings shown; the AI result is a real Kenerate Phota Enhance output from the same soft photo.
Checked 26 September 2026
Which sharpening method should I use?
All three Photoshop methods, and when to switch to AI.
| Smart Sharpen | Unsharp Mask | High Pass | AI enhancer · Kenerate | |
|---|---|---|---|---|
| Best for | Most photos | Quick web output | Selective sharpening | Blurry or soft photos |
| Noise control | Reduce Noise slider | Threshold | Mask it out | Removes noise |
| Fixes missed focus | No | No | No | Rebuilds detail |
| Skill needed | Medium | Low | Medium | None |
Better results
Sharpening tips that avoid halos and noise
- Sharpen last. Do colour, retouching and resizing first; sharpen for the final size.
- Judge at 100%. Zoomed-out previews hide halos and grain.
- Use a smart object so you can reopen the filter and change it.
- Mask the smooth areas. Skin, sky and backgrounds rarely need sharpening.
- Print needs more than screen. Ink spreads, so print sharpening can be stronger.
- Blur from missed focus is different. Filters can't invent lost detail — AI restoration can rebuild it.
How it works
How it works in the app
Step 1
Add the image to upscale
Open Image Upscaler and upload a photo, or pick one from your library or a link.
Step 2
Pick an upscaler and mode
Choose one of the upscalers, then Precise for a faithful copy, Creative for extra detail or Restore for old photos.
Step 3
Click Upscale
Press Upscale to create a sharper, larger copy of your image.
Step 4
Compare and download
Slide between the original and the upscaled result, then download the full-resolution file.
See it in the app
Open Image Upscaler and upload a photo, or pick one from your library or a link.
FAQ
Sharpening questions
8 questions
How do I sharpen an image in Photoshop?
Choose Filter → Sharpen → Smart Sharpen, set Amount (start around 100–150%) and Radius (0.5–1.5 px), choose Lens Blur in Remove, raise Reduce Noise if grain appears, and click OK. Apply it to a smart object so you can change it later.
Link to this answerWhat is the difference between Smart Sharpen and Unsharp Mask?
Unsharp Mask is the fast, traditional method with Amount, Radius and Threshold. Smart Sharpen adds noise reduction, a choice of blur to remove (Gaussian, Lens or Motion) and separate control of shadows and highlights.
Link to this answerCan Photoshop fix a blurry image?
Sharpening makes a slightly soft image look crisper by adding contrast along edges. It cannot recover detail lost to missed focus or heavy blur — an AI restoration model such as Phota Enhance does much better on those.
Link to this answerWhat are good Unsharp Mask settings?
For web images: Amount 80–120%, Radius 0.5–1 px, Threshold 0–3. For print, a slightly larger Radius. Always judge at 100% zoom.
Link to this answerHow do I sharpen without adding noise?
Use Smart Sharpen's Reduce Noise slider, raise Threshold in Unsharp Mask, or sharpen only edges with a mask. Or use an AI enhancer that removes noise and sharpens in one pass.
Link to this answerHow do I sharpen a low-quality JPEG in Photoshop?
Clean the JPEG blocks first, then sharpen gently. Run Filter → Noise → Reduce Noise with Remove JPEG Artifact ticked, then use Smart Sharpen with a small Radius (about 0.5–1 px) and Reduce Noise raised, so the blocks are not sharpened too. If the image is also small or blurry, an AI enhancer usually does better, because sharpening cannot add detail that was never captured.
Link to this answerShould I sharpen before or after resizing?
After. Resize to the final size first, then sharpen for that size and output — sharpening a large image and then shrinking it wastes the effect.
Link to this answerIs there a faster way than Photoshop?
Yes — upload the photo to an AI enhancer. On Kenerate, Phota Enhance sharpens soft and blurry photos in about 40 seconds, and Real-ESRGAN sharpens while it enlarges.
Link to this answerIn depth
How sharpening works under the hood
Unsharp masking, Smart Sharpen's options, and why sharpening can't replace focus — with sources.
On this page
Unsharp masking in one paragraph
Unsharp masking subtracts a blurred copy of the image from the original to isolate edges, then adds that edge detail back at higher contrast [1]. Radius sets how wide the edges are; Amount sets how strong; Threshold skips small differences such as grain.
What Smart Sharpen adds
Smart Sharpen lets you choose which blur to counter — Gaussian, Lens or Motion — and reduce noise while sharpening; Adobe notes Lens Blur detects edges and detail for finer sharpening with fewer halos [2].
Noise is the limit
Every sharpening method also sharpens noise, and noise is unavoidable in low light: photon counts vary pixel to pixel and high ISO makes it visible [3]. That's why Adobe built Denoise as a separate AI step, and why heavy blur is better handled by restoration models that rebuild detail rather than boost edges [4].
By the Kenerate AI teamLast updated and reviewed
Written by the Kenerate team. Menu paths from Adobe's help pages; the AI example is a real Kenerate output.
Sources: Adobe — Sharpen images with Smart Sharpen · Adobe — Sharpen images with Unsharp Mask · Unsharp masking — Wikipedia
Too blurry for Photoshop?
Phota Enhance rebuilds detail in about 40 seconds — no subscription required, no watermark.
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