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Azure App Service Crashes when Resizing Large Images

We are using Aspose.Imaging to resize customer uploaded jpg’s and png’s down to around 1k by 1k. We’ve noticed that when resizing large images (not large in terms of file size for example this occurs with a 2k png) but large in terms of width and height (9k by 11k) that our Azure App Service crashes with a catastrophic error and restarts. We get no error information because the entire app service restarts. When we run the app service locally in azure emulation mode the image resizing works correctly. It’s only when running the app service in Azure. We are using a Azure S1 (A Series compute equivalent) with 1.75 GB memory. Any help you give would be greatly appreciated.

Here’s the resizing code. DotNetFramework 4.7.2 (VB.Net)
When I attempt to upload the 2k image to this forum it tells me the image I’m attempting to upload is over 80 megapixels. Its dimensions are 9k by 11k and as I mentioned the file size on my drive is under 2k.

Here’s a link to the image.


‘’’ Proportionally resize the specified image file using the max width and height given, and
‘’’ if the original image is > 1MB, save as JPG at 90% quality

‘’’ Filepath of the original image to be resized
‘’’ Folder to hold the finished resized image
‘’’ Maximum desired width, in pixels
‘’’ Maximum desired height, in pixels
‘’’ Image resizing algorithm to use (see Aspose documentation)
‘’’ To scale only the width, set maxHeight to 0
‘’’ to scale only the height set maxWidth to 0
Public Function ResizeImage(originalImageFilePath As String, imagesOutputFolder As String, maxWidth As Integer, maxHeight As Integer, Optional algorithm As ResizeType = ResizeType.HighQualityResample) As ResizeImageResults
    Dim results = New ResizeImageResults()
    Dim resizedFileName As String = ""

        'Instantiate license.
        Dim AsposeLic As New License

        'Get physical file size of original image
        Dim fi = New IO.FileInfo(originalImageFilePath)
        Dim sourceFileSize = fi.Length
        Dim sourceFileName As String = Path.GetFileName(originalImageFilePath)
        Dim sourceFileNameWithoutExt As String = Path.GetFileNameWithoutExtension(originalImageFilePath)

        'Load the original image.
        Using img As Image = Aspose.Imaging.Image.Load(originalImageFilePath)
            Dim newHeight As Integer = img.Height
            Dim newWidth As Integer = img.Width
            Dim isResized As Boolean = False

            'Get the new, resized dimensions
            GetResizedDimensions(img.Width, img.Height, maxWidth, maxHeight, newWidth, newHeight)

            'If the new dimensions are not the same, resize the image to the new dimensions
            If newHeight <> img.Height Or newWidth <> img.Width Then
                AtlasWebUILog.LogInformation(String.Format("/ProduceReview/Resizing image '{0}' from {1}h x {2}w to {3}h x {4}w", originalImageFilePath, img.Height, img.Width, newHeight, newWidth))
                img.Resize(newWidth, newHeight, algorithm)
                isResized = True
            End If

            If sourceFileSize < 1048576 Then
                'The source file is < 1MB, no need to downgrade the quality
                If isResized = False Then
                    'No change was made to the original file dimensions
                    'Just copy the file to the output images folder
                    File.Copy(originalImageFilePath, imagesOutputFolder & "\" & sourceFileName)
                    results.IsChanged = False
                    results.ResizedFileName = sourceFileName
                    'The file dimensions were resized
                    resizedFileName = sourceFileName
                    img.Save(imagesOutputFolder & "\" & resizedFileName, True)
                    results.IsChanged = True
                    results.ResizedFileName = resizedFileName
                End If
                'File > 1MB, save as JPG and downgrade to 90% quality
                'Save as JPG and set to 90% quality
                Dim jpgOptions = New ImageOptions.JpegOptions()
                jpgOptions.Quality = 90
                'Change the file extension to .jpg
                resizedFileName = sourceFileNameWithoutExt & ".jpg"
                img.Save(imagesOutputFolder & "\" & resizedFileName, jpgOptions)
                results.IsChanged = True
                results.ResizedFileName = resizedFileName
            End If

            If results.IsChanged Then
                AtlasWebUILog.LogInformation(String.Format("/ProduceReview/Image '{0}' resized and saved as '{1}'", originalImageFilePath, imagesOutputFolder & "\" & resizedFileName))
            End If

        End Using

    Catch ex As Exception
        AtlasWebUILog.LogErrorWithException(String.Format("/ProduceReview error when resizing the image '{0}':", originalImageFilePath), ex)
        results.ResizedFileName = ""
        results.IsError = True
        results.ErrorMessage = ex.Message
    End Try

    Return results

End Function

@GPTW_Tech Please provide the sample file you are trying to resize when it crashes, so that we could reproduce the issue, and the code snippet of how you do it.

Please see above. I edited my original posting to include the items that you requested. Thank you!

@GPTW_Tech, In order to reduce RAM consumption, use the BufferSizeHint property in the class LoadOptions.
This will reduce RAM consumption, but very low values can slow things down considerably.
I think for you it would be optimal value equal to 128mb.
Please note that the BufferSizeHint is given in mb. those in your case it will be just 128.

Yes, that fixed the issue. Thanks very much!