I'm creating a thumbnail from an image saved in a db. If I write the
data directly to the stream, the image shows up perfectly.
Response.Clear( );
Response.Conten tType = myImage.Content Type;
Response.Binary Write( myImage.File );
But if i try and make a thumb, the image is distorted.
MemoryStream stream = new MemoryStream( myImage.File );
Bitmap bitmap = new Bitmap( stream );
Image image = bitmap.GetThumb nailImage( 100, 100, null, IntPtr.Zero );
image.Save( Response.Output Stream, bitmap.RawForma t );
Is there a way to make this clear? 5 2427
Hi,
Narshe wrote:
I'm creating a thumbnail from an image saved in a db. If I write the
data directly to the stream, the image shows up perfectly.
Response.Clear( );
Response.Conten tType = myImage.Content Type;
Response.Binary Write( myImage.File );
But if i try and make a thumb, the image is distorted.
MemoryStream stream = new MemoryStream( myImage.File );
Bitmap bitmap = new Bitmap( stream );
Image image = bitmap.GetThumb nailImage( 100, 100, null, IntPtr.Zero );
image.Save( Response.Output Stream, bitmap.RawForma t );
Is there a way to make this clear?
I think that what you mean with "distorted" is that you create
thumbnails having a size of 100*100 pixels, regardless of the original
size. If you want to keep the original proportions, you must calculate
the corresponding width, respectively height:
Bitmap bmpOriginal = new Bitmap( strPath );
int iNewHeight = m_iMaxSize;
float fRate = (float) iNewHeight / (float) bmpOriginal.Hei ght;
int iNewWidth = (int) Math.Round( (float) bmpOriginal.Wid th * fRate );
if ( iNewWidth m_iMaxSize )
{
iNewWidth = m_iMaxSize;
fRate = (float) iNewWidth / (float) bmpOriginal.Wid th;
iNewHeight = (int) Math.Round( (float) bmpOriginal.Hei ght * fRate );
}
Bitmap bmpNew = new Bitmap( bmpOriginal, iNewWidth, iNewHeight );
bmpNew.Save( Response.Output Stream, bmpOriginal.Raw Format );
In the code above, I have m_iMaxSize set by the user (in your case 100).
I use this way (more or less) to create thumbnails dynamically in this page: http://www.galasoft-lb.ch/pictures/welcome.aspx
It's true that the thumbnails look less clear than if produced using a
graphics application (I use SuperJpg when I want to make "static"
thumbnails). However, it's not that bad I think.
HTH,
Laurent
--
Laurent Bugnion, GalaSoft
Software engineering: http://www.galasoft-LB.ch
PhotoAlbum: http://www.galasoft-LB.ch/pictures
Support children in Calcutta: http://www.calcutta-espoir.ch
Laurent Bugnion wrote:
I think that what you mean with "distorted" is that you create
thumbnails having a size of 100*100 pixels, regardless of the original
size. If you want to keep the original proportions, you must calculate
the corresponding width, respectively height:
I actually have it doing something like this already, I just whipped up
sample code for an example.
The image is not clear. It's fuzzy and poor quality. I'll give your
method a try and see if that helps.
Hi,
Narshe wrote:
Laurent Bugnion wrote:
>>I think that what you mean with "distorted" is that you create thumbnails having a size of 100*100 pixels, regardless of the original size. If you want to keep the original proportions, you must calculate the corresponding width, respectively height:
I actually have it doing something like this already, I just whipped up
sample code for an example.
The image is not clear. It's fuzzy and poor quality. I'll give your
method a try and see if that helps.
As I said, the method of creating thumbnails programatically produces
thumbnails with lesser quality than dedicated programs. Check the page I
gave you to see if the quality is any better. The original images are
640*480 or 480*640, and the thumbnails go down to 120 pixels. http://www.galasoft-lb.ch/pictures/index.html
HTH,
Laurent
--
Laurent Bugnion, GalaSoft
Software engineering: http://www.galasoft-LB.ch
PhotoAlbum: http://www.galasoft-LB.ch/pictures
Support children in Calcutta: http://www.calcutta-espoir.ch
Laurent Bugnion wrote:
As I said, the method of creating thumbnails programatically produces
thumbnails with lesser quality than dedicated programs. Check the page I
gave you to see if the quality is any better. The original images are
640*480 or 480*640, and the thumbnails go down to 120 pixels.
Yes, they are a lot better. I used the google logo off their home page,
and brought the size down to 100x40 (iirc), and the image looks like it
is made up of a bunch of dots, like a news paper.
I haven't had a chance to try your method, been in a meeting, but I'll
let you know.
Thanks.
I tried your method and it still ended up fuzzy. Here's the pic http://www.yousendit.com/tr*********...****@gmail.com
-Josh
Narshe wrote:
Laurent Bugnion wrote:
As I said, the method of creating thumbnails programatically produces
thumbnails with lesser quality than dedicated programs. Check the page I
gave you to see if the quality is any better. The original images are
640*480 or 480*640, and the thumbnails go down to 120 pixels.
Yes, they are a lot better. I used the google logo off their home page,
and brought the size down to 100x40 (iirc), and the image looks like it
is made up of a bunch of dots, like a news paper.
I haven't had a chance to try your method, been in a meeting, but I'll
let you know.
Thanks.
This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Chris D |
last post by:
Hi,
I have an application where a user uploads an image and I create two
thumbnails. One a small image and the second is a larger image but still
smaller then the original. I store these in SQL 2000 server.
The quality of the small thumbnail is ok, but the quality of the larger
image is terrible. I tried both Jpeg and Gif formats and there is no
difference.
|
by: Trint Smith |
last post by:
How can I show image thumbnail??
thanks,
Trint
..Net programmer
trintsmith@hotmail.com
*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!
|
by: mo |
last post by:
Hi,
I have the following code to create a thumbnail from the input stream
System.Drawing.Image source;
source=System.Drawing.Image.FromStream(new
System.IO.MemoryStream(myData));
System.Drawing.Image image = source.GetThumbnailImage
150,150,null,IntPtr.Zero);
MemoryStream ms = new MemoryStream();
ImageFormat thisformat=image.RawFormat;
|
by: Øyvind Isaksen |
last post by:
Hello!
Does anyone know about an ASP.NET thumbnail script that generate thumbnail
with MAX quality?
Have tested some scripts, but the thumbnail is not getting as good quality
as I need.
This is the best result I have got so far:
Original picture: http://www.kromogkubikk.no/custom/artimgs/bakgard.jpg
Thumb, 128px:
|
by: Cédric |
last post by:
Hello,
Wanting to create a thumbnail of an image, i'm using the following piece of
code :
Public Sub Reduction(ByVal Source As String, ByVal Destination As String,
ByVal TailleX As String, ByVal TailleY As String, ByVal Resolution As
Integer, ByVal Fond As Boolean, ByVal ConserverRatio As Boolean, ByVal
PixelFormat As System.Drawing.Imaging.PixelFormat, ByVal ImageFormat As
System.Drawing.Imaging.ImageFormat, ByVal R As Integer, ByVal...
| |
by: Summercoolness |
last post by:
In PIL, since thumbnail() first makes a draft copy of the image, and
then resize it, so thumbnail() can run a lot faster than resize()
because draft() seems a lot faster when resizing from very big images
to small images... (such as the original image is 3000 x 2000, and it
can make a draft really quickly to 375 x 250, and then resize to, say
200 x 133 as a thumbnail)
However, the double resizing probably will make a thumbnail with a...
|
by: sakurasyi |
last post by:
hai guys... can someone solve my problems?
i'm doing a thumbnail program. But, i have some problems.
1. The thumbnail image become black (cannot see anything)
2. Can anyone know how to get the size (height and width) of the original image?
this is my code:
Image image = Toolkit.getDefaultToolkit().getImage(namePath);
MediaTracker mediaTracker = new MediaTracker(new Container());
mediaTracker.addImage(image, 0);
|
by: barb |
last post by:
So that the world at large benefits from our efforts, here is one fully
documented way to use Windows Irfanview freeware to create thumbnail web
galleries (http://www.irfanview.com).
STEP 1: Start with original thumbnails & two empty sub directories
STEP 2: Create smaller versions of the originals for one sub directory
STEP 3: Create thumbnail version of the originals the other sub directory
STEP 4: Create an index.html pointing to the...
|
by: tlhintoq |
last post by:
I'd like to think I can work out most issues, but this one is kicking my butt.
What's worse, is that I know I can't be the first guy to want to add a thumbnail to jpg that doesn't already have one. I see it in plenty of other applications. Yet I can't seem to make it work despite being so very close.
I know the problem has to be in how I am making the PropertyItem of the thumbnail - because if I comment out lines 24-34 the JPG saves fine,...
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
| |
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
|
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
| |
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
| |