PSD Photo Processor
How to Use Levels Adjustment for Batch PSD Photo Correction

How to Use Levels Adjustment for Batch PSD Photo Correction

Levels adjustment is a foundational step in photo correction. With Aspose.PSD for .NET, you can apply levels changes to hundreds of PSDs at once, ensuring visual consistency and pro-quality tone.

Real-World Problem

Inconsistent black/white points across photo libraries degrade brand and print quality. Manual Photoshop workflows can’t scale for e-commerce, catalogs, or archive projects.

Solution Overview

Script the addition and adjustment of Levels layers with precise input/output values to get repeatable, automated results.

Prerequisites

  1. Visual Studio 2019 or later
  2. .NET 6.0 or later (or .NET Framework 4.6.2+)
  3. Aspose.PSD for .NET from NuGet
  4. PSD file(s) for correction
PM> Install-Package Aspose.PSD

Step-by-Step Implementation

Step 1: Load the PSD File 

using Aspose.PSD;
using Aspose.PSD.FileFormats.Psd;

string inputFile = "./input/photo.psd";
string outputFile = "./output/photo_levels_corrected.psd";

var loadOptions = new PsdLoadOptions() { LoadEffectsResource = true };
PsdImage psdImage = (PsdImage)Image.Load(inputFile, loadOptions);

Step 2: Add a Levels Adjustment Layer 

var levels = psdImage.AddLevelsAdjustmentLayer();

Step 3: Configure Levels 

// Adjust master channel (index 0) for shadow, midtone, highlight
levels.MasterChannel.InputShadowLevel = 12;    // Set black point
levels.MasterChannel.InputMidtoneLevel = 1.0F; // Set gamma
levels.MasterChannel.InputHighlightLevel = 240; // Set white point

Step 4: Save the Corrected PSD 

psdImage.Save(outputFile);
psdImage.Dispose();

Use Cases and Applications

  • Batch-correct scanned or legacy photo tone
  • Enforce consistent black/white points in all assets
  • Pre-flight for print, e-commerce, or digital campaigns

Common Challenges and Solutions

Levels not affecting output: Check layer order—adjustment layers must be above.

Need for per-channel correction: Target Red, Green, Blue channels individually via levels.GetChannelByIndex().

Best Practices

  • Preview results on a calibrated display
  • Script for batch jobs across entire folders
  • Back up original files

FAQ

Q: Can I correct all channels at once? A: Yes—use the Master channel, or target RGB separately as needed.

Q: Can I export as JPEG or TIFF after correction? A: Yes—simply use the desired export options after adjustment.

Conclusion

With Aspose.PSD for .NET, you can automate photo quality for any number of PSD files. For more features, see the Aspose.PSD for .NET API Reference .

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