Imagesharp: Cannot load 48 bpp PNG (Bit depth is not supported or not valid)

[xakep139]

Prerequisites

• [x] I have written a descriptive issue title
• [x] I have verified that I am running the latest version of ImageSharp
• [ ] I have verified if the problem exist in both DEBUG and RELEASE mode
• [x] I have searched open and closed issues to ensure it has not already been reported

Description

I am trying to load valid PNG file with 48 bpp

Steps to Reproduce

Simple code that leads to System.NotSupportedException "Bit depth is not supported or not valid.":

Image.Load(File.ReadAllBytes("image.png"));

Stacktrace:

   at ImageSharp.Formats.PngDecoderCore.ValidateHeader()
   at ImageSharp.Formats.PngDecoderCore.Decode[TPixel](Stream stream)
   at ImageSharp.Formats.PngDecoder.Decode[TPixel](Configuration configuration, Stream stream, IDecoderOptions options)
   at ImageSharp.Image.Decode[TPixel](Stream stream, IDecoderOptions options, Configuration config)
   at ImageSharp.Image.Load[TPixel](Configuration config, Stream stream, IDecoderOptions options)
   at ImageSharp.Image.Load[TPixel](Configuration config, Byte[] data, IDecoderOptions options)
   at ConsoleApp1.Program.Main(String[] args) in c:\users\user\documents\Projects\ConsoleApp\Program.cs:line 14

Image to reproduce bug:

System Configuration

• ImageSharp version: 1.0.0-alpha9-00139
• Environment: Windows 10 Enterprise Version 1703 Build 15063.332
• .NET Framework version: netcoreapp1.1
• Visual Studio Professional 2017 Version 15.2 (26430.13)
• dotnet --info output:

.NET Command Line Tools (1.0.4)

Product Information:
 Version:            1.0.4
 Commit SHA-1 hash:  af1e6684fd

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.15063
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\1.0.4

[JimBobSquarePants]

Yeah, we don't support 48bpp png yet... Something to definitely look into.

[JimBobSquarePants]

@xakep139 That should do it 😄