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Rank: Aficionado
Joined: 7/29/2006
Posts: 491
Location: Melbourne, Australia
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yeah fair enough... just wanna avoid having images scale up higher than the original... better off just showing a small original file (u know when users upload photos taken on their mobile phones, etc).
anyone know how to interrogate an image file to discover its width or height? then it'd just be an extra function in imagegen.aspx to first check size of image before resizing.
Sometimes when I'm alone, I google myself...
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Rank: Umbracoholic
Joined: 7/20/2006
Posts: 1,018
Location: Charleston, West Virginia, United States
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The resize function is probably already getting the size if it is sizing proportionally. You may just want to place a parameter into the resize function that passes a boolean value for 'allowEnlarge', and then check that the sizes are bigger than the specified size.
• 2007 - 2008 MVP • Charleston, WV, USA • umbracoholic since Dec. 2004 (v.2.0) •
Achieved umbracoholic status on 2008-04-25
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Rank: Aficionado
Joined: 7/29/2006
Posts: 491
Location: Melbourne, Australia
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good point case... i'll check it out when i get a chance.
Sometimes when I'm alone, I google myself...
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Rank: Aficionado
Joined: 7/19/2006
Posts: 144
Location: NYC
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Doug, Just implemented ImageGen on a very image-intensive site, and I'm very very impressed with the power and speed of your software. I'm putting up a site with LOTS of really nice images so it's getting a good work-out. I'll post a link when it launches in a few weeks. Thanks much!! - Mark
Manhattan Heavy Industries“Algorithms are small but beautiful”, Dr. Karp observed.
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Rank: Aficionado
Joined: 7/29/2006
Posts: 491
Location: Melbourne, Australia
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hey all,
revisiting this old topic, is there a way to set the quality at which imagegen compresses images? I'm finding on the site i'm building that some images are not looking too good when compressed with imagegen - i'd like to set it to compress at setting of say 70-90 for jpeg images, but can't find how to... any suggestions?
otherwise, its a huge timesaver!
Sometimes when I'm alone, I google myself...
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Rank: Umbracoholic
Joined: 7/20/2006
Posts: 1,018
Location: Charleston, West Virginia, United States
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I am also dealing with something similar to your request. I was thinking of trying an httpHandler for the media section that the url could call the image with the size specified in the path, and a script would handle it the way you mention.
ie: /media/xxxxxxxxxxx/file/100x100/image.aspx
nGallery does this to a point, so I was thinking of robbing some of their code. :P
Case
• 2007 - 2008 MVP • Charleston, WV, USA • umbracoholic since Dec. 2004 (v.2.0) •
Achieved umbracoholic status on 2008-04-25
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Rank: Umbracoholic
Joined: 9/8/2006
Posts: 1,082
Location: KY, USA
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ImageGen has a ton of options, including the compression ratio for JPEG images, sizing, padding, borders, overlaying text on top of an image, changing an image's format, transparency, etc. etc. There is full documentation in the PDF that comes with the download. Use the COMPRESSION attribute for improving the quality of your JPEGs (the default is 80). Code:<img src="/umbraco/ImageGen.aspx?image=/images/big.jpg&width=100&compression=95" /> cheers, doug.
MVP 2007/2008 - Official Umbraco Trainer for North America - Percipient Studios
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Rank: Umbracoholic
Joined: 7/20/2006
Posts: 1,018
Location: Charleston, West Virginia, United States
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Is there any way to get source on ImageGen? Some of my clients are requiring it...
• 2007 - 2008 MVP • Charleston, WV, USA • umbracoholic since Dec. 2004 (v.2.0) •
Achieved umbracoholic status on 2008-04-25
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Rank: Aficionado
Joined: 7/29/2006
Posts: 491
Location: Melbourne, Australia
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Thanks for the info Doug... i've tried adding the &compression=95 to my xslt where its calling the images, restarted umbraco, deleted cache folder, and reloaded the page, but its still compressing at 80 (according to the xml file in the cache folder)... any ideas why?
Sometimes when I'm alone, I google myself...
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Rank: Aficionado
Joined: 7/29/2006
Posts: 491
Location: Melbourne, Australia
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Sorry, i'm a goose - was editing the wrong xslt. all good now :)
Sometimes when I'm alone, I google myself...
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Rank: Newbie
Joined: 2/8/2007
Posts: 3
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First of all, I've got to say, I really like Umbraco and the ImageGen plugin. I know from first hand (I'm a developer myself) that making all of this costs a lot of time and effort, keep up the great work!
But (yeah, there's always a "but".. ;)), I found a drawback to the ImageGen plugin. If you look at the source of an image generated by ImageGen, copy the url and paste it in your browser, you'll find that it's quite easy to flood a server.
Just change the width and height properties (imagegen.aspx?image=/media/***/***.jpg&width=99999&height=99999) to very large numbers and ImageGen starts calculating and stores everything in the cache dir of the server.
Is there a solution to this problem? (besides NOT using ImageGen ofcourse.. ;))
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Rank: Umbracoholic
Joined: 9/8/2006
Posts: 1,082
Location: KY, USA
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This is an interesting problem. ImageGen is not hacker proof in the sense that someone could change the query string parameters if they wanted to... possibly to the server's detriment. Have you seen this kind of problem in practice, or are you just trying to alleviate a potential problem? I've thought of adding a configuration file that would specify default parameters for ImageGen. Primarily I was thinking about obfuscating the path to the original image with a default path in a config file. That way a visitor wouldn't know the full path to the image being resized and therefore couldn't grab the original. I suppose something similar could be done with other parameters (and parameters could be added for ImageGen for this purpose), such as a maximum height and width and a flag for not allowing an image to be resized larger than the original. These global settings wouldn't be available to be overridden with a querystring setting so that would give some level of protection against bad people. The basic problem is that ImageGen uses the query string to pass in parameters. This makes ImageGen very powerful and flexible and easy to integrate with a web site, especially sites that are created dynamically. But it can also be a weakness, as you've noted. Does anyone have any ideas how that weakness might be handled without crippling ImageGen's strengths? thanks! doug.
MVP 2007/2008 - Official Umbraco Trainer for North America - Percipient Studios
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Rank: Fanatic
Joined: 7/20/2006
Posts: 253
Location: Boston, Massachusetts
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Hi Doug,
Could you allow for a configuration setting which caps the max size imageGen will scale up to? I'd also love it if you could disable scale-up.
Also, can you crop with imageGen? That'd be very useful for a few sites I've got going.
I'd like to echo everyone's sentiment - great plug-in!
Tom
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Rank: Umbracoholic
Joined: 7/20/2006
Posts: 1,018
Location: Charleston, West Virginia, United States
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The crop functionality came up recently for me as well. For that matter, they want it to be smart, and crop the best part of the image... Anybody have any thoughts.
• 2007 - 2008 MVP • Charleston, WV, USA • umbracoholic since Dec. 2004 (v.2.0) •
Achieved umbracoholic status on 2008-04-25
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Rank: Addict
Joined: 7/19/2006
Posts: 584
Location: Leigh-on-Sea, Essex, UK
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To crop the best part automatically is very difficult as the most interesting area is not always in the center of the photo/image. I think the fail safe way is to have a seperate upload for thumbnail/cropped image personally as you can vary the crop zoom and coordinates from photo to photo. If you want a cropper you would need some form of GUI to allow the user to specify the crop they wanted. Thats my 2 cents on it. Warren
Warren Buckley - Umbraco MVP 07 & certified level 1 developer | Creative Web Specialist - Warren Buckley's Blog
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Rank: Newbie
Joined: 2/8/2007
Posts: 3
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Hi Douglas,
Thanks for the reply. I haven't seen any misuse of ImageGen (yet). But I was experimenting with ImageGen for my own site and saw the potential risk.
I think that adding a configuration file would solve the problem. Maybe it's possible to make it so, that ImageGen accepts querystring properties by default, but if you set a property in the configuration file, it doesn't accept querystring properties anymore.
This way, ImageGen is still backwards compatible and very easy to integrate (if you don't mind about the potential risk) and if you do mind, just use the configuration file to override the querystring properties.
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Rank: Fanatic
Joined: 7/20/2006
Posts: 253
Location: Boston, Massachusetts
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For me, even the ability to crop to a specific dimension just from the center of the image would be great. I do that now in some layouts with just css overflow hidden, but that's the top left corner, centered would usually be better.
Tom
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Rank: Aficionado
Joined: 7/19/2006
Posts: 144
Location: NYC
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Warren Buckley (Creative Web Specialist) wrote:
To crop the best part automatically is very difficult as the most interesting area is not always in the center of the photo/image.
I looked into this a bit. On Flickr, they do cropping, and I think they always pick the center, and it _usually_ looks good. I would be happy with an option for that. Check out any of the square images on Flickr to see what I mean. I've told Doug that he should consider taking donations. ImageGen is just so useful! - Mark
Manhattan Heavy Industries“Algorithms are small but beautiful”, Dr. Karp observed.
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Rank: Fanatic
Joined: 10/9/2006
Posts: 317
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isn't there something in the config file that protects textgen from being called directly or am i crazy, couldn't the exact thing be applied to imageGen.aspx as well???
bootnumlock - aka bob baty-barr [ http://www.baty-barr.com]
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Rank: Fanatic
Joined: 10/9/2006
Posts: 317
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okay, that didn't work for me... what the heck is that setting for anyway?
bootnumlock - aka bob baty-barr [ http://www.baty-barr.com]
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