亮度與對比度調整器
FREE微調圖片亮度、對比度、飽和度和曝光。專業結果，即時預覽。
什麼是免費Brightness & Contrast Tool？
The Free Brightness & Contrast Tool by Nano Banana lets you fix dark photos and enhance image quality with precision adjustments. Whether your photos are underexposed, washed out, or lacking punch, our tool provides smooth sliders for brightness adjustment (-100 to +100) and contrast control. Features real-time preview, before/after comparison, and auto-enhance mode. Perfect for fixing phone photos, enhancing product images, or creating artistic effects. 100% free, browser-based, no watermarks.
為什麼選擇我們的Brightness & Contrast Tool？
Precise Control
Smooth sliders from -100 to +100 for both brightness and contrast. Fine-tune to exact levels.
即時預覽
See changes instantly as you adjust. No waiting for processing.
Before/After Toggle
One-click comparison between original and enhanced. Perfect your adjustments.
Auto-Enhance Mode
AI analyzes your image and applies optimal settings automatically.
Histogram Display
View tonal distribution for professional-level adjustment decisions.
Preserve Quality
Advanced algorithms maintain image quality even with significant adjustments.
如何Adjust Brightness & Contrast
上傳您的圖片
Drag and drop or click to upload. Supports JPG, PNG, WebP up to 50MB.
Adjust Sliders
Move brightness slider to lighten/darken. Adjust contrast for vivid or soft tones.
Preview & Compare
See real-time changes. Toggle before/after view for comparison.
Download Enhanced Image
Save your improved image in high quality. No watermarks added.
Brightness & Contrast Features
Brightness Control
Lighten dark photos or darken overexposed images. Range: -100 (darker) to +100 (lighter).
Contrast Adjustment
Increase for vivid, punchy images. Decrease for soft, dreamy effect.
Auto-Enhance Button
One-click AI optimization. Automatically fixes common exposure issues.
Live Histogram
See tonal distribution change in real-time. Professional exposure analysis.
Before/After View
Split-screen or toggle comparison. Ensure you're improving the image.
Reset Button
Instantly revert to original. Experiment freely without losing your image.
When to Adjust Brightness & Contrast
Fix Underexposed Photos
Brighten dark indoor shots, backlit photos, or evening images. Recover shadow detail.
Correct Overexposure
Darken washed-out images. Restore color and detail to bright photos.
Enhance Product Photos
Make product images pop. Proper contrast sells products better.
Improve Portrait Photos
Flattering brightness for skin tones. Appropriate contrast for depth.
Social Media Preparation
Ensure images look great on all screens. Consistent brightness across posts.
列印準備
Adjust for printer output. Screen brightness differs from print results.
Brightness & Contrast進階技巧
Adjust Brightness First
Get the overall exposure right, then fine-tune contrast for the finishing touch.
Don't Over-Adjust
Subtle changes (±20-30) often look more natural than extreme adjustments.
Watch the Histogram
Avoid clipping (pure white/black areas). Keep detail in highlights and shadows.
Consider the Subject
Portraits need less contrast than landscapes. Match adjustment to content.
Check on Multiple Devices
What looks good on your screen may differ on phones or prints.
Brightness & Contrast Tool vs 替代方案
Compare our free tool with other image adjustment options.
| 功能 | Nano Banana | 其他 |
|---|---|---|
| 價格 | 永久免費 | Lightroom: $9.99/mo, Photoshop: $20.99/mo |
| 即時預覽 | Yes, instant | Varies by tool |
| Histogram | Yes, live updates | Professional tools only |
| Auto-Enhance | AI-powered | Varies by tool |
| 處理 | Browser-based, instant | Requires installation |
| 學習曲線 | 無 | 專業工具需要培訓 |
用戶評價
Karen S.
Food Blogger
“My food photos look so much better! The auto-enhance feature is perfect for quick edits.”
Tom B.
eBay Seller
“Makes my product photos pop. Items sell faster with better-lit images.”
Nicole R.
Instagram Creator
“Essential for my content workflow. Quick, easy, and the results are professional.”
常見問題
Brightness shifts all pixels lighter (positive) or darker (negative) uniformly. It changes overall image exposure.