macneacail

Dear Rick: The problem belongs with the people at Microsoft who let bmp mask for png -- this is just a simple decision -- but one that has impacts years later. Paint.net is a good program. John

Dear Rick: -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- using (var inFile = File.OpenRead(NameofBitMap)) { var decoder = BitmapDecoder.Create(inFile, BitmapCreateOptions.None, BitmapCacheOption.None); var encoder = new PngBitmapEncoder(); var frame = decoder.Frames[0]; encoder.Frames.Add(frame); using (var outFile = File.OpenWrite(NameofBitMap + ".png")) { encoder.Save(outFile); } } ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- René Slijkhuis provides a simple workaround for the moment -- I prefer to think of bugs as unused features I read the blog content -- interesting Perhaps instead of breaking BMP images created using GDI that is still legal with the perversion that bmp is really PNG in some cases - maintaining the option or putting up a more descriptive error might have been useful. Renaming BMP to PNG worked. But rule number 101 from Computer Science 100 in 1978 - do not criticize other people's code, I always find is useful, although often ignored. As the great Jerry Pournelle once said "bend the punch cards - enjoy the day" RIP JP you are missed. Great program by the way. John

Thank you for the response. Each file is about 5 MB so it will not upload. Bitmap newBmp = new Bitmap(XL, Y, System.Drawing.Imaging.PixelFormat.Format24bppRgb); creates the file I wonder why does paint.net 4.1.6 open the files and paint.net has done so since I started using it in about 2012 John

These bitmaps load in Word, PowerPoint as well as paint

The bitmaps load with 4.1.6 - just reverted. I updated the drawing program to net4.8 - still had same error

Paint.net 4.2 will not open bmp files created using Microsoft Drawing Routines. paint.NET has been opening these files since 2012 Application version: paint.net 4.2 PaintDotNet.Imaging.UnknownImageFormatException (0x88982F07): D:\src\pdn\src\SystemLayer.Native\Imaging\WICImagingFactory.cpp (892) : hr = spDecoder->Initialize( spStream, static_cast<WICDecodeOptions>(metadataOptions)); at PaintDotNet.Interop.InteropErrorInfo.ThrowIfError() in D:\src\pdn\src\Base\Interop\InteropErrorInfo.cs:line 98 at PaintDotNet.SystemLayer.Native.x64.NativeUtilities.ThrowOnErrorImpl(Int32 hr, SByte* szHr, IUnknown* pFxErrorInfo) at PaintDotNet.SystemLayer.Native.x64.Imaging.WICImagingFactory.CreateDecoderFromStream(Stream stream, BitmapDecodeOptions metadataOptions, Nullable`1 containerFormat, Nullable`1 preferredVendor) at PaintDotNet.Data.WicFileTypeHelpers.Load(Stream input, Nullable`1 forcedContainerFormat, Nullable`1 preferredVendor, MetadataTranscoder metadataTranscoder) in D:\src\pdn\src\PaintDotNet\Data\WicFileTypeHelpers.cs:line 61 at PaintDotNet.Data.BmpFileType.OnLoad(Stream input) in D:\src\pdn\src\PaintDotNet\Data\BmpFileType.cs:line 93 at PaintDotNet.FileType.Load(Stream input) in D:\src\pdn\src\Data\FileType.cs:line 482 at PaintDotNet.Functional.Func.Eval[T1,TRet](Func`2 f, T1 arg1) in D:\src\pdn\src\Base\Functional\Func.cs:line 158