Posted by Bill Chambers on September 16, 2006 at 9:22 AM
I have noticed, and have received several comments, that some of the imges on my website have artifacts. It doesn't seem to affect all images. Some people seem to notice more than others.
I'm using JEPG images currently, normally sized between 200-300 KB.
My original JPEG's do not show ANY artifacts. They only seem to appear after they're inserted onto the web page and uploaded.
Do you think this is a web page issue or uploading issue?
Is there a better format (GIF, TIFF, etc.) for web use, or does anyone have any suggestions as to what is causing this.
Thanks.
Posted by Richard Wong on September 16, 2006 at 11:20 AM
jpeg is the only practical one for web use. Just convert to sRGB then go to Save for Web. That way it allows you to see what quality you will get for amount of compression.
Posted by Bill Chambers on September 16, 2006 at 2:39 PM
Richard - I've done that. The jpeg looks great on my monitor, but when I insert it onto the web page and upload it, then it goes haywire.
There are three possible causes. 1) Compressing during upload. 2) Compressing by your ISP when a request comes from a user's browser. 3) A user's ISP compressing before downloading to their computer. I experience the last of these when I attach to the Internet with my cell phone.
You can determine the first by downloading the image back to your computer and checking to see if it is the same as you uploaded. The program you used to upload hopefully can download too. If you eliminate that, you should call/email the company hosting your site to see if they compress (my second scenario above). I don't know of anything you can do if the third scenario is the culprit.
Hope this helps.
Posted by Bill Chambers on September 16, 2006 at 6:31 PM
Thanks David - That makes a lot of sense. I'll check those things out. Thank you!
Posted by Robert Helms on September 16, 2006 at 9:58 PM
Bill, I'm not sure how much help this will be, but here it goes. I'm on dial-up and AOL to be exact and there are times that I view images on the web that are really horrible looking in quality. On my AOL toolbar under the internet web options there is an setting that allows me to view files that are uncompressed. When I check the no compression tab and reload the image or website the image that looked horrible now looks good. The odd thing is this doesn't happen on every image and I cannot predict which images will look fine and which will look horrible
By default AOL compresses graphics and images in order to allow us stone age people faster surfing, at the expense of quality. The same image that will look horrible on my pc will look fine on someone who uses a cable connection.
I'm going to guess that those that mention your images having artifacts are those, like me, who are on dial-up. For what it is worth I went to your site last week, I believe, and again today and I didn't come across any images that looked bad to me.
The same issue you are having is one that is of concern to me as well since I'm currently working on my own site. The sad thing is I know of no way to get around this issue other than to use the no compression in my web options. However, this really slows things down so I always leave it on compress and then adjust the setting when the image warrants it.
We can't control other's web settings, but I have considered adding a little note someplace on my site to inform viewers on dial-up of this liability and how to correct it.
If this is the issue you are having and you find a solution please inform me.
Posted by Bill Chambers on September 16, 2006 at 10:17 PM
Thanks Robert for the info. That's definitely of interest. I like your idea of noting the compression issue problem for dial-up visitors. I may steal that from you if you don't mind.
Posted by Bill Chambers on September 17, 2006 at 7:40 AM
David - THANK YOU, you hit the nail on the head! I found out the images are being re-compressed during upload. Tech Support told me how to stop this. It will take a while as I will have to go back and rework each image, but hopefully within the week it will be solved.
Thank you so much for your help.
Posted by Basil Greber on September 17, 2006 at 11:19 AM
Glad to hear you figured it out! Was a pain to see many of those nice images degraded by artefacts.
Basil
Posted by Robert Helms on September 17, 2006 at 7:48 PM
Bill, I'm glad you figured this out and maybe I should check my own host before I upload any of my images
Feel free to note the compression issue on your site if you like. I feel it is a good idea since there are images on other people's site on NPN that I have viewed in which the extra compression really hurts them.
Maybe your misfortune will save myself from the same fate. If not then may be at least someone elses. Kinda sucks that you have to redo each image. I hate photoshop enough as is - much less having to go back and redo all the images
Discussion
9 repliesI'm using JEPG images currently, normally sized between 200-300 KB.
My original JPEG's do not show ANY artifacts. They only seem to appear after they're inserted onto the web page and uploaded.
Do you think this is a web page issue or uploading issue?
Is there a better format (GIF, TIFF, etc.) for web use, or does anyone have any suggestions as to what is causing this.
Thanks.
You can determine the first by downloading the image back to your computer and checking to see if it is the same as you uploaded. The program you used to upload hopefully can download too. If you eliminate that, you should call/email the company hosting your site to see if they compress (my second scenario above). I don't know of anything you can do if the third scenario is the culprit.
Hope this helps.
By default AOL compresses graphics and images in order to allow us stone age people faster surfing, at the expense of quality. The same image that will look horrible on my pc will look fine on someone who uses a cable connection.
I'm going to guess that those that mention your images having artifacts are those, like me, who are on dial-up. For what it is worth I went to your site last week, I believe, and again today and I didn't come across any images that looked bad to me.
The same issue you are having is one that is of concern to me as well since I'm currently working on my own site. The sad thing is I know of no way to get around this issue other than to use the no compression in my web options. However, this really slows things down so I always leave it on compress and then adjust the setting when the image warrants it.
We can't control other's web settings, but I have considered adding a little note someplace on my site to inform viewers on dial-up of this liability and how to correct it.
If this is the issue you are having and you find a solution please inform me.
Thank you so much for your help.
Basil
Feel free to note the compression issue on your site if you like. I feel it is a good idea since there are images on other people's site on NPN that I have viewed in which the extra compression really hurts them.
Maybe your misfortune will save myself from the same fate. If not then may be at least someone elses. Kinda sucks that you have to redo each image. I hate photoshop enough as is - much less having to go back and redo all the images