Web Forms :: JPEG Compression And Resizing?
Jun 1, 2010
I have an application with a FileUpload control. The code behind saves the uploaded file (which I've stipulated in the code must have a ".jpeg" extension) to the webserver's hard disk. Details about the image, such as its ID, Title, Description and Upload date are saved in an MS SQL Server database. Nothing difficult here.
What I'd like to do instead... is take the uploaded image (which will be a "large", high-quality image), save this as above but ALSO dynamically resize and resample a copy of this image and store a thumbnail of it on the webserver hard drive as well.
I can't find a post which explains how to do this in this forum group. Can anyone point me in the right direction for an answer. I am using Visual Studio 2008, ASP.NET 3.5 and Visual Basic.NET 2008.
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Aug 4, 2010
I'm tring to implement what Steve Souders discusses [URL] about forcing gzip compression
I've got a module that's running this:
[code]....
CompressionUtils.GzipSupported just checks for the 'accepts-encoding' header while
CompressionUtils.GzipSupportedExplicitly and CompressionUtils.GzipNotSupportedExplicitly check for the cookie saying whether the browser really can read gzip
But when I load a page in Firefox I get this error:
Content Encoding Error
The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.
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Mar 23, 2010
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Jan 31, 2010
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Dec 20, 2010
I wondering what's the easiest way of exporting blobimages to physical jpegs?
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Feb 7, 2012
<form id="form1" runat="server"> <div id="dvforimage"> <asp:TextBox ID="Txtimage" runat="server"></asp:TextBox> <b>This is text</b> <img id="imgforconvert" src="images.jpg" alt="img1" /> </div> <asp:Button ID="btnforimage" runat="server" Height="28px" Width="72px" Text="ok" onclick="btnforimage_Click" /> </form>
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Apr 27, 2016
i want to compress image size into 40 or 50 kb
string CustomerID = "";
if (Session["RoleID"] != null)
{
CustomerID = Request.Form["CustomerID"];
//string CustomerID = Request.Form["Customer.CustomerID"];
if (CustomerID != null)
{
[CODE]...
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Nov 3, 2012
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May 10, 2010
My website provides a facility to upload images, using the ASP.NET FileUpload control. We accept both jpeg and tiff formats but I have just decided that all tiffs should be converted to jpegs at the time of upload. If possible, I want to avoid saving the original tiff to disk. I would any sample coding for achieving this conversion prior to saving (ideally in VB.NET, though I could always run C# code through a converter).
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Jan 6, 2011
My website provides a facility to upload images, using the ASP.NET FileUpload control. We accept both jpeg and tiff formats but I have just decided that all tiffs should be converted to jpegs at the time of upload. If possible, I want to avoid saving the original tiff to disk.
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Apr 5, 2010
I'm having a little problem with textboxes automatically resizing after postback.
I have a textbox on set with a width of 90%.
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Is there a way to turn this off? I have been searching and can't seem to find anything..
I realize that if I set it to a fixed with this problem goes away if I set a fixed width but I need it at 90%.
Also, I have some multi-line textboxes and they have the same issue, even though it's multi-line, it still becomes a little bigger wrap less times than it can.
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Mar 7, 2014
i am trying to compress video files by using gzip in asp.net.
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Aug 17, 2010
As the first step, I designed a Master Page for my website. Everything seems to be in order. My master page has a table say "Mytable" with 2 rows.
In the first row, I've put up a banner for the website.
In the second row, I want to place the ContentPlaceHolder.
The thing is that I can't make the ContentPlaceHolder to occupy the whole cell. I tried finding the solution through search engines and could not find out a solution.
In my web page, I want to create a table by Javascript. I mean that I want to make this table to occupy the second row of "Mytable". There is still some gaps left at the top and bottom of the ContentPlaceHolder.
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Nov 2, 2010
I have a master page(created for pop ups as i have a lot..) with the following code:
<body>
<div id = "weadas>
content content content..
<div>
<script type="text/javascript">
var content = document.getElementById("weadas");
window.resizeTo(content.offsetWidth + 50, content.offsetHeight + 50);
</script>
</body>
Wich i call with the following linkbutton:
lbnDictionary.Attributes.Add
(
"onclick",
"window.open('../ijSistema/ijPopUp/ppUpDictionary.aspx','mywindow','width=auto,height=auto,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,copyhistory=no,resizable=no'); return false;"
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Any ideas of how to optimize that resizing code for asp.net?
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Jul 17, 2010
In trying to upload images to a server, I often get the following error "Maximum request length exceeded.".
I have tried to check for the size in codebehind but it appears that the error comes from the service provider or something else because I never even get to debug it since the error appears even before the Page_Init Subroutine in codebehind.
What is the best method of checking for the image size and then resizing it dymamically to a maximum file size as well as length and width size.
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Apr 11, 2010
how to disable the resizing of a multiline textbox control. I'm trying to use the textarea to display rules for a contest, however I dont want them to be able to change the size of it by dragging it around from the bottom right corner.
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Jun 10, 2010
I have a 40x1600 image that I use for bg and I do repeat-x in my CSS, like such:
body
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May 21, 2010
dynamically resize a user control depending on the container it is currently in,or the other way around.and be able to resize a container based on the user controls size.Let me explain.Right now I have a page using the Ajax TabContainer and within one of the tabs I have my user control.My user control accepts a DataSet and simply lists the results in a GridView.
Right now when you go to the tab everything displays fine, except the results go all the way to the bottom of the page.What I would like to do,is to either resize the TabPanel to match the amount of data,or have a fixed height/width for the user control and make it scrollable.This user control can be on a number of different pages with different sized containers,so I am at a standstill.Has anyone done anything like this before or have an idea how it could be accomplished?
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Mar 11, 2011
I have a photo on my server image1.jpg in high resolution, and I need it to be resized everytime it is send to client depending with dimension I put but should not make extra file on disk.
I used aspjpeg for this in past but now I need something that can be used on servers that do not have aspjpeg instaled.
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Apr 22, 2010
Me with C# asp.net 2.0 In my application I have 2 web pages and 1 folder, the folder may contain a jpeg or bmp or pdf file. when I click a button in the the first web page how can I open the 2nd web page and show the file in the folder.
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Jan 18, 2010
So on my site, a user has the ability to create an avatar. It's created by the user selecting from several images; there is a base "skin" image, and png's that overlap that image that depict hair, eyes, mouth, etc.
I cannot save the user's avatar to the project's files, so the user's avatar data is stored in the database, and the png's are overlapped on the fly and displayed to the user.
However, I'd like to have the ability for the user to download their avatar as a jpeg by going to a page.
I have this little example set up that is working correctly:
protected void Page_Load(object sender, EventArgs e)
{
//User has skin1.png, eyes3.png, and mouth8.png
Bitmap bit = new Bitmap(System.Drawing.Image.FromFile(Server.MapPath("/images/skin1.png")), 80, 106);
Response.ContentType = "image/jpeg";
bit.Save(Response.OutputStream, ImageFormat.Jpeg);
}
But, as you can see, I only have this working for a single image. I'd like to create a bitmap from the multiple png's and output a jpeg.
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Jan 15, 2011
i want to upload files that are only jpeg, jpg etc. But i couldn't filter the files in the opening window. I want to change the text "all files" to jpeg etc. in the asp.net. (C#)
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Jun 17, 2012
I use these code for resizing image
behind code
public string img_resize(string picname, int maxHeight, int maxWidth)
{
System.Drawing.Image currentImage = System.Drawing.Image.FromFile(server.mappath("mypics") + picname);
double imgHeight = 0;
double imgWidth = 0;
imgHeight = currentImage.Height;
imgWidth = currentImage.Width;
[code].....
but in this line occur error
<ItemTemplate> <%#img_resize(Eval("my_img"),100, 80)%> </ItemTemplate>
error: Parser Error
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. Parser Error Message: The server tag is not well formed.
what should i do ?
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Sep 24, 2010
I have an ASP.NET website where we are generating pdf's and web pages using crystal reports. One of the requirements we have is for in the pdf's to have a map of NY state with markers on it that are placed based on GIS Coordinates. For the web page we can do this easily with google maps. if there are any third party map generating solutions that can do this? We currently use map info and google maps, but I dont think either are capable of doing this?
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Nov 17, 2010
I want to upload a pdf file from my asp.net website. and i want to show the pdf file as jpeg in image control.
how to convert the pdf file to jpeg format while uploading pdf file.
My Pdf file will contain only one page.
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