Bulk Brightness Adjustment

About Bulk Brightness Adjustment

Adjust the brightness of multiple images simultaneously. Perfect for batch processing photos that are too dark or too bright, correcting exposure issues, or creating consistent lighting across image collections.

How to Adjust Brightness on Multiple Images

1. Click "Upload Images" and select multiple images at once
2. Adjust the brightness slider:
   • Slide left (negative values) to darken images
   • Slide right (positive values) to brighten images
   • Range: -100 (very dark) to +100 (very bright)
   • 0 = no change to brightness
3. Preview the effect on uploaded images
4. Click "Process All Images" to apply brightness adjustment
5. Download individual images or all as a ZIP file

Best Uses for Bulk Brightness Adjustment

• Correcting underexposed (dark) photos from poor lighting
• Fixing overexposed (bright) photos from too much light
• Creating consistent lighting across photo series
• Preparing images for print with proper brightness
• Adjusting scanned documents or photos
• Normalizing lighting for e-commerce product photos
• Correcting batch photos from the same shoot
• Preparing images for social media with optimal brightness

Understanding Brightness Values

Brightness adjustment adds or subtracts values from each pixel:

• -100 to -50: Significant darkening. Use for very overexposed images or to create dramatic dark effects. Can lose detail in shadows.
• -49 to -20: Moderate darkening. Good for slightly overexposed photos or reducing glare. Preserves most detail while darkening.
• -19 to -5: Subtle darkening. Minor correction for slightly bright images. Very safe range with minimal detail loss.
• 0: No change. Original brightness preserved.
• +5 to +19: Subtle brightening. Minor correction for slightly dark images. Adds gentle lift to shadows.
• +20 to +49: Moderate brightening. Good for underexposed photos or dark images. Reveals shadow detail effectively.
• +50 to +100: Significant brightening. Use for very underexposed images. Can wash out highlights if overused.

Brightness Guidelines

• Underexposed photos: Start with +30 to +50 and adjust based on results. Check if highlights wash out.
• Overexposed photos: Start with -30 to -50 and adjust. Monitor shadow areas for detail loss.
• Indoor photos with flash: Often need +10 to +25 to compensate for dim lighting.
• Outdoor sunny photos: May need -10 to -20 if too bright or washed out.
• Scanned documents: Usually +20 to +40 to improve legibility and contrast.
• Night photography: +40 to +70 to reveal details while maintaining mood.