What are the sizes for?

Hello, Bunzer.

Are you still using Sell Media plugin? Have the image sizes been solved?

This plugin seems very promising! I’m now testing (not yet set up paypal sand box account, though) and also wondering how different size of photos (e.g. L, M, S) are created for downloads.

No action is needed by you regarding download sizes. Sell Media creates download sizes during download.

If this is the case, it’ll be great. In that case, the only concern will be the quality of the resized photos. Anyway, I’ll continue the testing. Thanks for the nice plugin!

Please report back the result of your tests. I’m very eager to know.

This plugin without doubt is very promising. Unfortunately the issue I found is a big turn off.

Handoko, Image sizes have been fixed, but the plugin is stripping all metadata from the files, which means, IPTC/Copyright, EXIF and ICC profile information is being stripped from resized images.

Thanks for letting me know that the issue has been fixed.

Stripping metadata can be both a good and bad thing. The good is it can make the file size smaller and download faster. The bad, some authors may want to keep it as it can provide extra information like description, author and copyright.

Here has explanation about purpose for using Exif metadata:
https://commons.wikimedia.org/wiki/Commons:Exif

It will be nice if the plugin has option to let users enable or disable stripping metadata feature.

Now, I’m more interested to use Easy Digital Downloads plugin, it’s more matured, has lots more user downloads and far higher ratings. Perhaps you may want to give it a try. I still not decided which one to use, will make some testings on both plugins.

Still continuing the test. Stripping ICC profile is not a good news cos the colour may get shifted for those resized images…

Jamie, publishers often deal with AdobeRGB images, so anyone supplying AdobeRGB originals will face this problem. Untagged versions will be interpreted as sRGB, and will appear washed out.

Ideally, the plug-in should provide an option to do a colour space conversion. I’m not holding my breath.

Handoko, I agree that stripping EXIF is not necessarily a bad thing. You must agree though that removing an ICC profile tag is pretty bad, and most would argue that stripping IPTC metadata is not to be encouraged in the current climate.

I have also looked at EDD, and I agree that’s it’s a much more mature plugin. There is no resizing facility, if I remember correctly, and there were other suitability problems too, but I can’t remember them now.

I may have another look at EDD, as I am finding it very frustrating working with the developers of Sell Media, which still seems a long way off being fit for purpose.

Thanks for the feedback.

Regarding the download process, its pretty straight forward, “images are resized during download”, if you can detail you can view it here.

Bunzer,
Can you provide any examples of websites that allow you to sell photos and have a “colour space conversion option”? I haven’t seen that before and didn’t think that would be a determining factor in the plugin.

I do agree that stripping IPTC/EXIF data may not be expected at first, but this is actually default WordPress behavior.

Zane,

I can’t think of any to be honest, and I don’t know if this is supported in ImageMagick or GD2 off the top of my head, I was thinking out loud.

Certainly, if colour space conversion is too difficult, then you shouldn’t be wasting your time with it. BUT, if an original is tagged with a colour space, the tag should not be stripped. That’s just wrong.

I use GIMP which is open source software. It uses GEGL (Generic Graphics Library) for processing images. Perhaps Zane can have a look at it.

Here is the quote I found on wikipedia

babl, a support library for GEGL, provides a generic way to deal with color-space conversions; babl operates abstracting the fundamental color operations so that GEGL need not be aware of them. Through babl, GEGL provides an optimized and powerful (optionally with SIMD support) treatment of arbitrary color data; this enables dependent applications to efficiently support a wide range of color spaces (from 8-bit RGB to full floating point CMYK) with minimal extra application-code.

Useful links:
https://en.wikipedia.org/wiki/GEGL
https://www.gegl.org/