StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POAsJPEG().Save not working after converting CIImage to UIImage
primarykey
Id
14691130
data
AcceptedAnswerId
14692342
AnswerCount
1
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-02-04T16:35:12.577
FavoriteCount
0
LastActivityDate
2013-02-04T17:43:45.703
LastEditDate
LastEditorUserId
0
OwnerUserId
1558119
ParentId
0
PostTypeId
1
Score
0
ViewCount
341
LastEditorDisplayName
text
Body
<p>I'm using CIImage's ImageByCroppingToRect function to crop an image that's originally a UIImage. The crop works. When I do a "originalImage.AsJPEG().Save" that works as well. I've tested and confirmed that the file it saves is a working JPEG. But when I do a "croppedImage.AsJPEG().Save" I get a "System.NullReferenceException: Object reference not set to an instance of an object" error on its line. Both originalImage and croppedImage are UIImages, the only difference is that croppedImage originated from a converted CIImage that did the crop... but why would that cause this error? It's a UIImage so it should work, right? And I know the image in croppedImage exists because of the line "view.Image = croppedImage;" where I outputted the image to the screen so I can see that the crop worked.</p> <p>Below is the source code and this link is the actual project including the jpg image: <a href="https://www.dropbox.com/s/erh0yrew8pyuye7/TestImageCrop.zip" rel="nofollow">https://www.dropbox.com/s/erh0yrew8pyuye7/TestImageCrop.zip</a></p> <pre><code> // Create an image from a file UIImage originalImage = UIImage.FromFile("IMG_0072.jpg"); // Create a UIImageView UIImageView view = new UIImageView(new RectangleF(0,0,300,300)); this.View.AddSubview(view); // Crop the image using CIImage's ImageByCroppingToRect function CIImage testCIImage = new CIImage(originalImage).ImageByCroppingToRect(new RectangleF(0,0,500,500)); UIImage croppedImage = new UIImage(testCIImage); view.Image = croppedImage; // Store the image to a file string Path = Environment.GetFolderPath ( Environment.SpecialFolder.MyDocuments ) + "/"; NSError err = new NSError(); originalImage.AsJPEG().Save(Path+"originalImage.jpg", true, out err); // Here is where the error is happening. If I save the originalImage as a JPEG, it works just fine. // But if I save the croppedImage as a JPEG, it errors out saying "System.NullReferenceException: Object reference not set to an instance of an object" croppedImage.AsJPEG().Save(Path+"croppedImage.jpg", true, out err); </code></pre>
Tags
<c#><xamarin.ios><crop><core-image><ciimage>
Title
AsJPEG().Save not working after converting CIImage to UIImage
singulars
PostAcceptedAnswerId
1. PO
  singulars
  PostTypePostTypeId
  PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USLampShade
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
  singulars
  PostTypePostTypeId
  PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.