The problem I have is that I'm working with a CMS system Which is not originally designed by me. when I upload a product image to the cms at size 319x319 its size is around 13KB. The system is designed to cache the image and make a copy of it at 170x170, so it can be used elsewhere on the site, when i view that cached (smaller) image it remains at the same size, some on the website have even grown in size(memory that is).
Now i could only find one obscure reference with this happening in joomla, see link below
http://forum.joomla.org/viewtopic.php?f=709&t=821407
I'm wondering whether there is a way to prevent this happening as a way of decreasing my overall page size, or am I looking completely in the wrong place?
Thank you in advance for any help
You can use imagikmagick for image manipulation.
Related
I am using yslow in which it tells don't scale images in HTML but the images are coming from database and I use them using bootstrap grids. Most of the images are show in popup on click.
The image width I set is in the css file in percentages like max-width:100% or width:100%;, but I don't know what to set to not scale the images in HTML.
I don't know how to resolve this issue. Please help me.
YSlow is telling you this because it is not a good practice to resize images in HTML, especially if the images become smaller, as this means you spend too much time downloading.
You don't need to take everything performance monitors like YSlow are telling you as an action item. The reports are only recommendations. As #Amin Gharavi said, if the images load fast enough for you, then it's probably okay.
The problem is if you are downloading images that are MUCH bigger than their apparent visual, which usually means much slower download in addition to lower visual quality in some browsers.
I currently have a page with about 20 or images with source data pulled from a database.
I display them at width of 100px and I have a hover function that appends an element with the full size image with a width of 250px.
I decided to use the full size version for the original image and just scale it down to 100px instead of using a thumbnail version. My thinking on this was that on this page it is very likely that the user will hover over most of the images so the page would end up having to load the full size version for most of the images anyway so why make them download the thumbnail AND full size version for each element. Also scaling from 250px to 100px didn't seem to display much if any distortion in the smaller element.
Now I am running my page through Google page speed analyzer and it really does not like me using larger than necessary images for the smaller elements. Of course it is ignoring the fact that those larger images are being used for the dynamically created popups.
In order to make my page play nice with Google's page speed tester I am giving in and using thumbnails for the smaller elements but I also want to prefetch the larger image to avoid an annoying delay when the user hovers over the element. This means I am essentially loading 2 versions of the same image just to make Google speed test not yell at me.
This seems ridiculous to me so I wanted to ask if this is really the best way to do this or is there another way to make my page play nice with Google speed test.
Thanks,
Adam
If you know what you're doing, there's no need to be a slave to the PageSpeed score.
Loading two copies of the images could make actual page speed slower. However, it depends on what you are trying to optimize for. Loading thumbnails first and then large versions could be better if you want time to full render to be fast (so the users can see the page) and then load the big images in the background to add interactivity later.
Or is it better to have fast time to interactivity, and time to full render doesn't matter that much. Then maybe having one copy of each image is better.
Currently for my webpage's banner, I'm using http://workshop.rs/projects/coin-slider/ to have 4 images sliding. On the office's slower computers the coin slider seems to be very laggy.
My question is, would animating the 4 images into a single GIF file be better/faster? Are there better options to create a 4-image-moving banner?
Try using a lightweight image gallery, I found some here. The coin slider is lightweight 8KB but there are ones even lighter 2KB or so.
You could technically use a GIF but I think there are some mobile compatibility issues, you can also have better functionality with javascript/jQuery galleries.
As far as slow computers go there isn't much you can do about that, I wouldn't worry too much about it. Just do some extra research on how to minimise files and deliver a faster site.
Gif is not a wise alternet for sliders..you could reduce the quality of your Images and compress them..or if you are using large images and resizing them in slider, you can re size them with any image alteration tool. This will reduce image size too.
And I hope you are not giving images path direct internet links, cause this will automatically increase the loading time.
By linked images, I mean having an image in a directory and giving the path to the image in order to set an objects display or background. I've noticed that since using this method, my page is taking a considerable amount of time to load. So if this is the issue, what would be the alternative?
Thanks
I suggest using the Firebug addon for Firefox.
It breaks the loading time down and explains how long each thing takes to load.
But from your question i would say no, it shouldn't add any extra loading time on.
(I assume you mean loading an image from /index/pictures compared to /index/)
EDIT: Looking at your comments you say "more detailed image"... does this mean a larger file size and if so how large?
You can answer your question yourself by using firebug, We can't without asking a lot more questions since you have left so much needed information out. :/
Regardless of the location of the file, your browser still has to obtain the file. The key word there, is browser.
The data (regardless of type) is downloaded to the client (browser).
Regarding image size, try reducing image size, there are plenty of programs out there (I've found VSO image resizer rather useful in the past)
Remember, slow loading webpages effect SEO!
Basically what I am asking is, is there a way to have say a 1000x1000 pixel image and simply have some sort of code, whether html, css, or anything else to only download a resized verison of 100x100 pixels. Is there any way to do this? I would like to know before resizing each of my pictures and uploading them and linking those photos to the original larger version. Thanks.
You can't do it with HTML/CSS but it is possible with a server side language like PHP. Here's a script that will allow you to resize images.
The catch is that resizing images can be a server intensive process. You should try to make sure that once you've created a resized version of an image, it's cached on the server for subsequent requests.
Along those lines, the flow should be:
Image request comes in.
Does the resized thumbnail exist in the server's cache? If yes, serve the thumbnail.
If no, create the thumbnail, place it in the server cache and serve it.
Note: James brought up a good point in the comments. If the images you're resizing are going to change (updated/edited), you'll need to keep track of their large image's last modified date when you create the thumbnail (as part of the filename or in a database).
That way, when you check the cache, you'll be able to tell if the thumbnail needs to be regenerated.
You can create an account on imageshack.us (create the account to make sure your images don't get deleted) and then upload the image in different sizes and link to whatever size you want. (You don't have to do the resizing yourself, you can do it on imageshack when you upload) That way you get the image in whatever size you want and without putting any load at all on your server.
That's what I do and it works wonderfully
Example:
http://img52.imageshack.us/img52/1825/lakesunset.jpg
http://img12.imageshack.us/img12/6420/lakesunsetf.jpg
Both came directly from imageshack. Just uploaded the image twice and resized one on imageshack.
Then to display the thumbnail and link it to the larger one just use this code:
<img src="DIRECT SMALL IMAGE URL"/>
Example:
http://img12.imageshack.us/img12/6420/lakesunsetf.jpg
Sorry, I've never done any server side programming since I'm not a professional and I'm poor, so I can't help you if that's what you're looking for.