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Converting .pdf to .tiff turns background blue

Hi,
Trying to convert the pdf file to .tiff results in a .tiff file with a blue background. Any idea what the cause may be?

Thank you

@ofir.skylabs

Can you please share the used sample code, source file and generated output. We will be able to investigate that on our end on provision of requested information.

I can not share the file it contains customer’s private information
We have purchased from you around 6 years ago a package/converter for .NET

ColorDepth colorValue = (ColorDepth)Enum.Parse(typeof(ColorDepth), asposeCompressPDF);
if (!Enum.IsDefined(typeof(ColorDepth), colorValue))
{
throw new ApplicationException(“Invalid Aspose Compress Parameter: ConvertCompressPDF. Allowed: Format8bpp, Format4bpp, Format1bpp”);
}
//Create TiffSettings object (To reduce file size, change color settings)
TiffSettings tiffSettings = new TiffSettings();
// CompressionType.LZW is the default CompressionType
tiffSettings.Compression = CompressionType.LZW;
// Allowed: 0 (default), Format8bpp, Format4bpp, Format1bpp
tiffSettings.Depth = colorValue;

                    try
                    {
                        converter.SaveAsTIFF(stream_out, tiffSettings, new WinAPIIndexBitmapConverter());
                    }
                    catch (Exception ex)
                    {
                       
                        if (colorValue != ColorDepth.Default)
                        {
                            tiffSettings.Depth = ColorDepth.Default;
                            converter.SaveAsTIFF(stream_out, tiffSettings, new WinAPIIndexBitmapConverter());
                        }
                    }

@ofir.skylabs

The file is required because it is hard to determine the cause of the issue without replicating it in our environment.