WordPress.com Forums » Topic: png resize bug?

memming on "png resize bug?"

memming — Sun, 10 Feb 2013 22:29:21 +0000

And finally, now it's working in all computers. Strange!

memming on "png resize bug?"

memming — Sun, 10 Feb 2013 22:19:52 +0000

The image is recovered in one of my local machines, and also it works fine through a proxy in a different state within US, but it still shows a broken image on one of my computers!!

memming on "png resize bug?"

memming — Sun, 10 Feb 2013 22:18:09 +0000

I am using a proxy through a different country, and it shows correctly over there, but I still see garbled image through the computers with local address. I doubt this is because of a (transparent) cache.

memming on "png resize bug?"

memming — Sun, 10 Feb 2013 22:10:50 +0000

It's happening again now, for both firefox 18 and chrome. I am testing from two computers with different IP addresses, and total of 4 browsers. All of them are showing a broken image now.

memming on "png resize bug?"

memming — Sun, 10 Feb 2013 18:15:54 +0000

Yes, it looks fine even in Chrome now. Thank you for warning about the beta version, but I do not believe that's causing the problem.

This problem comes and goes. Someday I'll find the image garbled, and then after refreshing endlessly, it comes back to normal. I am suspecting that some of the backend media servers which are doing the resizing has problems. (Then if the load-balancer switches me to another backend, it goes away.)

In full image size, I never had this problem.

justjennifer on "png resize bug?"

justjennifer — Sun, 10 Feb 2013 18:07:23 +0000

Beta versions of browsers are generally not supported and I just had a look in FF 18 and the PNG in this post looks fine http://pillowlab.wordpress.com/2013/02/05/lab-meeting-242013-asymptotically-optimal-tuning-curve-in-lp-sense-for-a-poisson-neuron/

Have you tried just uploading your image and select to insert at Full Size and link it to the Media File? Otherwise optimize your image to the width of the content posting area for the theme you are using.

memming on "png resize bug?"

memming — Sun, 10 Feb 2013 18:00:47 +0000

I am testing on Chrome 25.0.1364.68 beta, and firefox 18.0.1. I've seen this happen on a couple of different computers.

I like to have a smaller thumbnail display of a bigger figure, so that when you click on it you can see the full size figure. I guess I could upload them in two sizes and manually link them. But I don't see why wordpress.com would provide the functionality, but incompletely.

My image are originally vector graphics with sparse pixels. I wish I could use svg or pdf...jpg will be bad for these.

notawoodpecker on "png resize bug?"

notawoodpecker — Sun, 10 Feb 2013 17:56:03 +0000

w=584&h=250

I've found it's best not to use the size attributes, but to upload the correct size image to begin with.

There are a number of free image editing tools to resize and recompress images. I think you'll have better luck with .jpgs too over .pngs.

justjennifer on "png resize bug?"

justjennifer — Sun, 10 Feb 2013 17:56:01 +0000

What browser and version are you using?

memming on "png resize bug?"

memming — Sun, 10 Feb 2013 17:52:15 +0000

What the hell? After many forced refreshes, now it works again. This has to be a bug, right?

memming on "png resize bug?"

memming — Sun, 10 Feb 2013 17:49:53 +0000

I thought it was fixed, but after a week, the png is again rendered weirdly.
Take a look at
http://pillowlab.files.wordpress.com/2013/02/w.png?w=584&h=250

It was resizing correctly for a few days and it broke again. What is going on?

justjennifer on "png resize bug?"

justjennifer — Tue, 05 Feb 2013 16:42:56 +0000

It is mentioned in the Image Troubleshooting Support doc http://en.support.wordpress.com/images/#troubleshooting

Images should be saved in RGB mode, and you will see the best results if you use the sRGB color profile.

memming on "png resize bug?"

memming — Tue, 05 Feb 2013 16:41:27 +0000

Using imagemagick did the trick.

convert a.png -color 10 b.png

will make a RGB color table of size 10 from indexed color image a.png.

memming on "png resize bug?"

memming — Tue, 05 Feb 2013 16:33:34 +0000

I see. Thank you.

I wish wordpress.com will warn me about indexed color!

justpi on "png resize bug?"

justpi — Tue, 05 Feb 2013 16:30:59 +0000

That's because the image is in indexed color. Needs to be RGB color.

memming on "png resize bug?"

memming — Tue, 05 Feb 2013 16:15:33 +0000

Automatic resize of png files generates distorted outputs. It renders without the resizing options at the end of URL, but gets distorted with it.
For example, compare
http://pillowlab.files.wordpress.com/2013/02/wang2012_blogpost.png?w=584&h=250
with
http://pillowlab.files.wordpress.com/2013/02/wang2012_blogpost.png

Fromt the first image, what I see is
http://pillowlab.files.wordpress.com/2013/02/screen-shot-2013-02-05-at-10-12-42-am.png?w=584&h=281

It used to work, and sometimes it seems to come back, but most of the time it doesn't work properly.