# PDFOptimizationCompressQuality Enum

> Specifies the quality level for lossy image compression during PDF optimization.

- Product: Adobe PDF Library 21
- Language: .NET Framework
- Version: APDFL21.0.0PlusP1e
- HTML page: https://docs.datalogics.com/apdfl21/DotNetFramework/APDFL21.0.0PlusP1e/enum/PDFOptimizationCompressQuality
- Version index: https://docs.datalogics.com/apdfl21/DotNetFramework/APDFL21.0.0PlusP1e/llms.txt

**Namespace:** `Datalogics::PDFL`

## Description

Specifies the quality level for lossy image compression during PDF optimization.

Higher quality values produce larger files with better visual fidelity.

## Values

- `PDFOptimizerCompressQualityUnset = 0`: Quality has not been set; the optimizer will use its default.
- `PDFOptimizerCompressMinimum = 1`: Minimum quality, resulting in the smallest file size.
- `PDFOptimizerCompressLowQuality = 2`: Low quality compression.
- `PDFOptimizerCompressMediumQuality = 3`: Medium quality compression, balancing size and fidelity.
- `PDFOptimizerCompressHighQuality = 4`: High quality compression.
- `PDFOptimizerCompressMaximumQuality = 5`: Maximum quality compression, resulting in the largest file size among lossy options.
- `PDFOptimizerCompressLossless = 6`: Lossless compression, preserving the original image data exactly.