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Old Apr 30, 2011, 12:29 PM   #1
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Default Problems with the upload of pictures

Hi all,

I have a little odd problem with the upload of pictures to this forum.

When I upload pictures, they often lose sharpness. Before uploading they appear very sharp on my screen, after uploading they looks a little bit out of focus. This effect didn't appear when I upload the pictures to an other forum.

Any suggestions?

Cheers,

Stefan
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Old Apr 30, 2011, 2:35 PM   #2
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Hi Stefan, it happens with you and with all of us

The forum processes the images on atach and they lose quality.

You can upload you photos to online photo albuns like Picasa ou Flickr and here at Steve's you just use a reference to the images. No quality loss that way


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Old Apr 30, 2011, 3:28 PM   #3
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Quote:
Originally Posted by StefanS View Post
Hi all,

I have a little odd problem with the upload of pictures to this forum.

When I upload pictures, they often lose sharpness. Before uploading they appear very sharp on my screen, after uploading they looks a little bit out of focus. This effect didn't appear when I upload the pictures to an other forum.

Any suggestions?
Yes. Don't exceed the maximum allowed sizes for dimensions or file size. ;-)

When you use the Attachments manager (paperclip icon) to upload an image, you'll see the maximum allowed sizes shown by each file type on the screen that comes up with a browse button on it. For jpeg files, the file size should be no larger than 253KB (260,000 bytes), and the dimensions in pixels should be no larger than 1024 pixels on the longest side.

If it's larger than the maximum allowed sizes, the forums will attempt to downsize and recompress the image (and that will result in loss of quality), and will strip out the EXIF information in the image header to try and make the image "fit" within our maximum limits. But, if it's too much larger than the maximum sizes allowed, it may fail to upload at all.

So, it's a good idea to use an image editor to downsize your images first (making the longest side no larger than 1024 pixels), using a compression setting (JPEG Quality slider in most editors) that keeps the file size less than 253KB. Usually, a setting of around 80% JPEG quality (or around 8 if your editor is using a scale of 1 to 10 or 1 to 12) is good enough to keep the file size small enough for uploading to our servers, provided the image size in dimensions is within limits (downsized so that it's no more than 1024 pixels on the longest side).

If you're using Windows, you may want to try the free Irfanview to resize your images.

After opening an image (File>Open), just go to the Image>Resize/Resample choice and make the longest dimension no larger than 1024 pixels (and around 800 is fine), making sure the box to retain aspect ratio is checked. Personally, I use the Lanczos algorithm for resizing (you'll see a drop down list of choices).

Then, after you resize the image so that the dimensions are smaller, use the File>Save As choice and give it a new filename (so that you don't overwrite your original), selecting JPG as the file type. When saving a JPEG file, you'll see a box pop up with a JPEG quality slider. I'd make it about 80% to keep the file size where it's not too large for an image with dimensions of around 800 pixels on it's longest side.

In order to prevent the forums software from modifying images, they must not be any larger than 1024 pixels on their longest side, and the file size should not be any larger than 253.9KB (260,000 bytes).

If you stay within those limits, then the forums software will not modify images you attach to posts.
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Old Apr 30, 2011, 4:15 PM   #4
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Jim,

thanks a lot.

I have replaced the attached files with new compressed files and now the quality is much better.

Cheers,

Stefan
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Old Apr 30, 2011, 5:55 PM   #5
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Yep.. the libraries the forums are currently using for resizing images are not very good. So, it's usually a bad idea to let the forums' software modify images (which will happen if the file size or dimensions are over the maximum sizes allowed).
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