I am trying to extract thumbnails from source jpegs and save them to the file system, using the C# ImageSharp library. I see there is some mention of it in the intellisense for the component:
SixLabors.ImageSharp.Image.Metadata.ExifProfile.CreateThumbnail()
...but I can't seem to find any documentation for it or examples to call it correctly.
I did find this:
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
//method code:
Image<TPixel> thumbnail = image.Metadata.ExifProfile.CreateThumbnail<TPixel>();
https://docs.sixlabors.com/api/ImageSharp/SixLabors.ImageSharp.Metadata.Profiles.Exif.ExifProfile.html
...but I need to find where the TPixel type is to get it to work. VisualStudio doesn't recognize it and I can't seem to find a namespace or use it correctly:
"The type or namespace name 'TPixel' could not be found (are you missing a using directive or an assembly reference?)"
Legacy Windows .NET Framework could do this for System.Drawing.Image.Image.GetThumbnailImage() and it worked pretty well.
EDIT: Using tocsoft's answer, I changed the code to:
if (image.Metadata.ExifProfile != null)
{
Image<Rgba32> thumbnail = image.Metadata.ExifProfile.CreateThumbnail<Rgba32>();
thumbnail.Save(thumbnailPath, encoder);
}
...however, the image.Metadata.ExifProfile is null, which is unexpected since I know these source images have EXIF data.
EDIT: Actually, it's working now. Success! Thank you!
TPixel would be any of the pixel formats in the SixLabors.ImageSharp.PixelFormats namespace. But unless you are planning on interoperating with other systems that require the pixel data layed out in memory in specific ways you will likely just want to use Rgba32
Image<Rgba32> thumbnail = image.Metadata.ExifProfile.CreateThumbnail<Rgba32>();
Related
I am trying to experiment with Native Forms in XF. I have this in iOS working right. That is fine.
In Android, I am getting the following error:
'MainPage' does not contain a definition for 'CreateSupportFragment' and the best extension method overload 'PageExtensions.CreateSupportFragment(ContentPage, Context)' requires a receiver of type 'ContentPage'
The code is erroring in the following code:
var _cp = new MainPage(); // my page from XF.
_list = _cp.CreateSupportFragment(this);
I have made sure that my nuget packages are up to date. I have cleaned and compiled. I've done a bunch of things, but alas, no love. Any ideas on this?
TIA
you need add the line to head of source:
using Xamarin.Forms.Platform.Android
because CreateSupportFragment is an extension method defined in it.
I wanted to place a google static map in a pdffile generated by using the fpdf extension.
and used code to make a tempfile first. Using this code. However I run into an error ('can't open image file').
// define the mapurl
$fullURL = 'http://maps.googleapis.com/maps/api/staticmap?center=Amsterdam&z=14&size=100x100&sensor=false';
// create a tempfile
$tempF = tmpfile();
fwrite($tempF, file_get_contents($fullURL));
//Rewind to the start of file
rewind($tempF);
// place the image in the pdf.
if (!empty($tempF)) {
$this->Image($tempF,$start_x, $this->GetY(),0,100);
}
fclose($tempF); // remove the tempfile
Note: OP's own answer extracted from the question.
Then I found out it can be done much easier... I don't need to use a tempfile. If I put the url in the image variable and give a format the thing works in two lines.. I don't use the height and width parameters in fpdf because they stretch the image into a unreadable form.
$fullURL = "http://maps.googleapis.com/maps/api/staticmap?center=". \
$row-Google_coor."&zoom=10&size=2200x200\
&markers=color:blue%7Clabel:D%7C".$row->Google_coor;
$this->Image($fullURL,$start_x, $this->GetY(),0,0,"PNG");
Saddly when using this function sometimes the program returns an error. The image could not be found. But when I put the url string in the browser the image shows up fine. Hopefully this is also a minor fallback.
Lets see if I find a solution on the google apis site https://developers.google.com/maps/documentation/staticmaps/?csw=1
For what it is worth I had this problem as well, I found that my server had an outgoing connections manager, this would automatically block the request, I had to add the ip, once this was done it worked fine.
I had a problem similiar to the OP's. I was getting an error when using FPDF and trying to get the static map image from Google Maps and into my PDF. I was getting "FPDF error: Missing or incorrect image file". What I did is to register in the Google Developer Console and get an API Key, just like they say in the documentation
Hope this helps.
You can download the image and use it with fpdf
$url ="https://maps.googleapis.com/maps/api/staticmap?center=Brooklyn+Bridge,New+York,NY&zoom=13&size=600x300&maptype=roadmap&markers=color:blue%7Clabel:S%7C40.702147,-74.015794&markers=color:green%7Clabel:G%7C40.711614,-74.012318&markers=color:red%7Clabel:C%7C40.718217,-73.998284&key=".$googleApiKey;
$img = __DIR__.'/img/map.png';
file_put_contents($img, file_get_contents($url));
$pdf->Image($img,null,null,170);
Hope that this will be helpful
I've spent the last day trying to get a checkbox validator to work. I found some starting code on the 4GuysFromRolla website, however this was coded back in 2006 and doesn't play alongside updatepanels.
I've made changes and now it works. As I'd made quite a few changes I wanted to standardise it and use it alongside other utility classes, so I created a new class project and copied the code verbatim.
The problem is that the original works, but I get a WebResource not found error on my new class project.
The differences are: The original was a web application project:
my new project is simply a class library project.
The original assembly and namespace have changed.
Both contain a single class and a resource file (.js)
Both resource files are contained in the root directory
Both resource files are set to embed resource
I'm running out of ideas, and have exhausted the answers I've found on the web with no success.
Is there an issue with the fact that its a class library? Have I perhaps overlooked something else?
Its pretty difficult to see beyond those 2 questions because the project is so small and insignificant.
Here's the code that does work:
if (this.RenderUplevel && this.Page != null)
{
ScriptManager.RegisterClientScriptResource(Page, this.GetType(), "skmValidators.skmValidators.js");
}
Here's the code that doesn't:
if (this.RenderUplevel && Page != null)
{
ScriptManager.RegisterClientScriptResource(Page, this.GetType(), "ValidationExtender.EvaluationFunctions.js");
}
Anyone give any ideas?
Thanks in advance.
The error turned out to be a mismatch between the dll's in the test page.
I am a newbie in yaml but I have to work on as3yaml which I don't have any knowledge on it.
I already downloaded as3yaml and attached to my project which is Flex project and I already read about yaml syntax.
But I don't have any ideas how can I start to work on it. I don't know how to new .yaml file with eclipse. I can't find any .yaml new file.
For now I understand that I have to create .yaml file and have to write the function on Actionscript Class to encode/decode the .yaml file.
And I also need some get started websites which I can learn myself.
Pls help!
I've never used Yaml as well, however it seems pretty straightforward:
var yaml:YAML = new YAML();
var data:Object = YAML.decode(yourYamlString);
You should really try reading the docs. Also, I wouldn't recommend using YAML unless you really have to. If you can, use AMF (native, faster, parses directly into model) but if you want something a little more 'web standardized' you can use JSON with the as3core library to parse it.
After I migrated my project from Windows to Mac, every time I try to embed an asset in Flash builder like this:
[Bindable] [Embed("assets/assets.swf#mySymbol")]
public var myClass:Class;
I get this error:
[Embed] requires named attributes
if I close the files containing the embedding, it compiles fine and doesn't give any problem.
I googled the error, and haven't found anything similar.
If I remember correctly:
[Embed(source="assets/assets.swf", symbol="mySymbol")]
These are named attributes FB is telling you about - source and symbol.
Update: as Jason Towne mentioned, the only required attribute is source. Symbol allows to bind specific symbol from swf to variable.