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Sheet to Image rendering - Distorted transparent PNG image captured

Our application captures transparent PNG images for use in email distribution. This is because some recipients use dark background vs. others with a light background.

Aspose seems to be distorting the image when a transparent background is used, but not when a fill is used for the cells.

Please see the following screenshots and attached solution for a demo of the issue.

Transparent:

image.png (758 Bytes)

Fill:

image.png (948 Bytes)

Solution:

AsposeDistortedImageIssue.zip (5.3 MB)

@mhopkins,
I have tried this scenario using the latest version but could not observe this issue. You may please try this scenario with the latest version and share your feedback. The output generated with the latest version is attached here for your reference.

fill.png (44.2 KB)
transparent.png (38.2 KB)

Ahsan,

I just tried with the 21.9 Nuget package and I’m still seeing the problem. Is there a newer unrelease version where this is fixed?

Thanks,

Matt

@mhopkins
I have also used NuGet package manager to download the latest version. Please share your environment details where this issue is tested. Also do you find this issue in the images shared here? If yes, please identify for our reference.

The images you posted earlier look great and not distorted at all.

Excel Information

image.png (1.9 KB)

Device name QBIT-5K5CWT2
Processor Intel® Xeon® E-2176M CPU @ 2.70GHz 2.71 GHz
Installed RAM 32.0 GB (31.7 GB usable)
System type 64-bit operating system, x64-based processor
Pen and touch No pen or touch input is available for this display
Edition Windows 10 Enterprise
Version 20H2
Installed on ‎11/‎16/‎2020
OS build 19042.1110
Experience Windows Feature Experience Pack 120.2212.3530.0

Visual Studio Info

Microsoft Visual Studio Professional 2019
Version 16.8.3
VisualStudio.16.Release/16.8.3+30804.86
Microsoft .NET Framework
Version 4.8.04084

Installed Version: Professional

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ASP.NET Web Frameworks and Tools 2019 16.8.554.20160
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Azure App Service Tools v3.0.0 16.8.554.20160
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Azure Data Lake Tools for Visual Studio 2.6.1000.0
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Azure Stream Analytics Tools for Visual Studio 2.6.1000.0
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@mhopkins,
Thank you for sharing the environment details. We have observed the issue and logged it in our database for further investigation. You will be notified here once any update is ready for sharing.

This issue is logged as:
CELLSNETCORE-268 - Distorted image created when a transparent background is used

Thanks for the update.

-Matt

@mhopkins

When you draw a text to a tranparent image, the text will be burred. Please add set AntiAlias for text.
So the ImageOrPrintOptions will be:

new ImageOrPrintOptions
{
    OnePagePerSheet = true,
    ImageType = Aspose.Cells.Drawing.ImageType.Png,
    HorizontalResolution = 200,
    VerticalResolution = 200,
    Transparent = true,
    TextRenderingHint = TextRenderingHint.AntiAlias,
}

@Peyton.Xu ,

Thank you for the “hint”. This works great.

I see that the default value for TextRenderingHint is set to SystemDefault. What does Aspose look for in the OS, Windows 10 in my case, when determining what the system default is?

Thanks again,

Matt

@mhopkins,
We have noted your query and will share our feedback soon.

@mhopkins

We pass the TextRenderingHint in ImageOrPrintOptions to System.Drawing.Graphics.TextRenderingHint(the default value is SystemDefault) while generating the output image.