Our 'Compress JPEG to 100KB' tool employs a sophisticated compression algorithm specifically designed to achieve a target file size of 100KB while preserving image quality as much as possible. Here's a breakdown of how it works:

1. Image Analysis: When you upload an image, our tool first analyzes its characteristics, including dimensions, color complexity, and current file size. This analysis helps determine the optimal compression strategy.

2. Adaptive Compression: Based on the analysis, the algorithm adapts its compression parameters. For images already close to 100KB, it applies gentle compression. For larger images, it uses more aggressive techniques while striving to maintain visual quality.

3. Quality Optimization: The tool uses a perceptual quality model that mimics human vision to make intelligent decisions about which image details can be simplified with minimal visual impact.

4. Metadata Stripping: To reduce file size, the algorithm removes non-essential metadata (like EXIF data) that doesn't affect the image's appearance.

5. Color Optimization: The color palette is optimized, reducing the number of colors where possible without noticeable quality loss. This is particularly effective for images with large areas of similar colors.

6. Chroma Subsampling: This technique reduces color information more than brightness information, taking advantage of the human eye's lower sensitivity to color details.

7. Progressive Encoding: The JPEG is encoded in a progressive format, which often results in smaller file sizes and allows for faster perceived loading on web pages.

8. Iterative Refinement: If the first compression attempt doesn't hit the 100KB target, the algorithm iteratively adjusts its parameters, fine-tuning the balance between file size and quality until it reaches as close to 100KB as possible.

9. Final Optimization: A final pass is made to optimize the JPEG encoding tables, ensuring the most efficient compression possible for the specific image content.

10. Quality Assurance: Before finalizing, the tool performs a quality check, comparing the compressed image to the original to ensure the visual difference is within acceptable limits.

By combining these advanced techniques, our tool achieves the challenging task of compressing JPEGs to a precise file size while maintaining the best possible image quality. Whether you're optimizing images for web performance, meeting upload requirements, or managing storage constraints, our 'Compress JPEG to 100KB' tool provides a powerful solution that balances size, quality, and precision.