V 0.91 Transparency Loss / Corruption

[JamesToronto]

V0.91
W8.1
64 bit

Please see the posts at the following link:

http://www.inkscapeforum.com/viewtopic.php?f=5&t=22521&p=81315#p81315

ISSUE:

PNGs properly saved and exported from V 0.91 with all Alpha channels set to 0 and then uploaded to Shopify repeatedly show with no transparency / black abstract colouring.

PNG as test file from http://tavmjong.free.fr/INKSCAPE/MANUAL/html/File-Export.html in V 0.47 or 0.48 when uploaded to Shopify appears normal with full transparency / no corruption.

When above test file is saved, opened in V 0.91, then saved and exported as a PNG with all Alphas at 0, and is then uploaded to Shopify as a V 0.91 file, all transparency is lost / black abstract colouring appears.

FINDINGS

Inkscape V 0.91 PNG files uploaded to Shopify are not transparent. Large number of other postings on other forums strongly suggest problem applies to many other sites.

CONCLUSION

Bug exists in V 0.91 causing loss of transparency with PNGs when uploaded to numerous websites especially Shopify; fully tested on Shopify; proof being that earlier version test file works fine, but when converted to a V 0.91 file, corruption appears.

[Hachmann (marenhachmann)]

James, could you also download and attach the modified png from the shopify website? (not a screenshot, the actual image file - right-click on it and choose to save the image).

[JamesToronto (tallon-james)]

Requested file attached.

Note the only file format save option is JPG. Perhaps a conversion error
one might think. But:

1) Shopify Forum Expert states as per last post in link to Inkscape post
that Shopify does not convert images upon upload; and,

2) All other PNGs not created with Inkscape that were uploaded to same site
had no loss of transaparency or corruption, and after upload, only have JPG
as the file format option under "Save Image As . . . "

Hope this helps - James

On 29 February 2016 at 21:42, Hachmann <email address hidden> wrote:

> James, could you also download and attach the modified png from the
> shopify website? (not a screenshot, the actual image file - right-click
> on it and choose to save the image).
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1551479
>
> Title:
> V 0.91 Transparency Loss / Corruption
>
> Status in Inkscape:
> New
>
> Bug description:
> V0.91
> W8.1
> 64 bit
>
> Please see the posts at the following link:
>
> http://www.inkscapeforum.com/viewtopic.php?f=5&t=22521&p=81315#p81315
>
> ISSUE:
>
> PNGs properly saved and exported from V 0.91 with all Alpha channels
> set to 0 and then uploaded to Shopify repeatedly show with no
> transparency / black abstract colouring.
>
> PNG as test file from http://tavmjong.free.fr/INKSCAPE/MANUAL/html
> /File-Export.html in V 0.47 or 0.48 when uploaded to Shopify appears
> normal with full transparency / no corruption.
>
> When above test file is saved, opened in V 0.91, then saved and
> exported as a PNG with all Alphas at 0, and is then uploaded to
> Shopify as a V 0.91 file, all transparency is lost / black abstract
> colouring appears.
>
> FINDINGS
>
> Inkscape V 0.91 PNG files uploaded to Shopify are not transparent.
> Large number of other postings on other forums strongly suggest
> problem applies to many other sites.
>
> CONCLUSION
>
> Bug exists in V 0.91 causing loss of transparency with PNGs when
> uploaded to numerous websites especially Shopify; fully tested on
> Shopify; proof being that earlier version test file works fine, but
> when converted to a V 0.91 file, corruption appears.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/inkscape/+bug/1551479/+subscriptions
>

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[Hachmann (marenhachmann)]

In that case, it probably *is* a jpg. To do a final verification, please do this in your browser:

- right-click on the image
- select 'show graphic info' in the context menu
- Does it still say it's a jpg? Then it *is* a jpg.

What I think is that the Shopify person's comment was maybe referring to another picture size, not to this thumbnail size.

When they resize, they will probably use the jpg format, which, because of the mentioned transparency bug in Inkscape (https://bugs.launchpad.net/inkscape/+bug/1430716), converts to a black background instead of white.

[JamesToronto (tallon-james)]

You are correct. The thumbnail version upon upload is indeed a JPG. Upon
saving and displaying on web page, it shows as being converted back into a
PNG. Screen capture attached to document that JPG is indeed the file type.
Many thanks for your fast replies. All the best with this bug.

Regards - James

On 1 March 2016 at 13:34, Hachmann <email address hidden> wrote:

> In that case, it probably *is* a jpg. To do a final verification, please
> do this in your browser:
>
> - right-click on the image
> - select 'show graphic info' in the context menu
> - Does it still say it's a jpg? Then it *is* a jpg.
>
> What I think is that the Shopify person's comment was maybe referring to
> another picture size, not to this thumbnail size.
>
> When they resize, they will probably use the jpg format, which, because
> of the mentioned transparency bug in Inkscape
> (https://bugs.launchpad.net/inkscape/+bug/1430716), converts to a black
> background instead of white.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1551479
>
> Title:
> V 0.91 Transparency Loss / Corruption
>
> Status in Inkscape:
> New
>
> Bug description:
> V0.91
> W8.1
> 64 bit
>
> Please see the posts at the following link:
>
> http://www.inkscapeforum.com/viewtopic.php?f=5&t=22521&p=81315#p81315
>
> ISSUE:
>
> PNGs properly saved and exported from V 0.91 with all Alpha channels
> set to 0 and then uploaded to Shopify repeatedly show with no
> transparency / black abstract colouring.
>
> PNG as test file from http://tavmjong.free.fr/INKSCAPE/MANUAL/html
> /File-Export.html in V 0.47 or 0.48 when uploaded to Shopify appears
> normal with full transparency / no corruption.
>
> When above test file is saved, opened in V 0.91, then saved and
> exported as a PNG with all Alphas at 0, and is then uploaded to
> Shopify as a V 0.91 file, all transparency is lost / black abstract
> colouring appears.
>
> FINDINGS
>
> Inkscape V 0.91 PNG files uploaded to Shopify are not transparent.
> Large number of other postings on other forums strongly suggest
> problem applies to many other sites.
>
> CONCLUSION
>
> Bug exists in V 0.91 causing loss of transparency with PNGs when
> uploaded to numerous websites especially Shopify; fully tested on
> Shopify; proof being that earlier version test file works fine, but
> when converted to a V 0.91 file, corruption appears.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/inkscape/+bug/1551479/+subscriptions
>

--
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for the use of the intended recipient(s), are confidential, and may be
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that any review, retransmission, conversion to hard copy, copying,
circulation or other use of this message and any attachments is strictly
prohibited. If you are not the intended recipient, please notify the sender
immediately by return e-mail, and delete this message and any attachments
from your system. Thank you.

Information confidentielle: Le présent message, ain...

[JamesToronto (tallon-james)]

Last 2 cents: I see that the bug has an undecided to medium priority. My
vote is for a higher priority in that for sites that use JPG thumbnail
previews for images, Inkscape V0.91 PNGs cannot be used, meaning users must
use another program. If my thinking is wrong, give a shout please; if not,
many thanks - James

On 1 March 2016 at 18:08, James Tallon <email address hidden> wrote:

> You are correct. The thumbnail version upon upload is indeed a JPG. Upon
> saving and displaying on web page, it shows as being converted back into a
> PNG. Screen capture attached to document that JPG is indeed the file type.
> Many thanks for your fast replies. All the best with this bug.
>
> Regards - James
>
> On 1 March 2016 at 13:34, Hachmann <email address hidden> wrote:
>
>> In that case, it probably *is* a jpg. To do a final verification, please
>> do this in your browser:
>>
>> - right-click on the image
>> - select 'show graphic info' in the context menu
>> - Does it still say it's a jpg? Then it *is* a jpg.
>>
>> What I think is that the Shopify person's comment was maybe referring to
>> another picture size, not to this thumbnail size.
>>
>> When they resize, they will probably use the jpg format, which, because
>> of the mentioned transparency bug in Inkscape
>> (https://bugs.launchpad.net/inkscape/+bug/1430716), converts to a black
>> background instead of white.
>>
>> --
>> You received this bug notification because you are subscribed to the bug
>> report.
>> https://bugs.launchpad.net/bugs/1551479
>>
>> Title:
>> V 0.91 Transparency Loss / Corruption
>>
>> Status in Inkscape:
>> New
>>
>> Bug description:
>> V0.91
>> W8.1
>> 64 bit
>>
>> Please see the posts at the following link:
>>
>> http://www.inkscapeforum.com/viewtopic.php?f=5&t=22521&p=81315#p81315
>>
>> ISSUE:
>>
>> PNGs properly saved and exported from V 0.91 with all Alpha channels
>> set to 0 and then uploaded to Shopify repeatedly show with no
>> transparency / black abstract colouring.
>>
>> PNG as test file from http://tavmjong.free.fr/INKSCAPE/MANUAL/html
>> /File-Export.html in V 0.47 or 0.48 when uploaded to Shopify appears
>> normal with full transparency / no corruption.
>>
>> When above test file is saved, opened in V 0.91, then saved and
>> exported as a PNG with all Alphas at 0, and is then uploaded to
>> Shopify as a V 0.91 file, all transparency is lost / black abstract
>> colouring appears.
>>
>> FINDINGS
>>
>> Inkscape V 0.91 PNG files uploaded to Shopify are not transparent.
>> Large number of other postings on other forums strongly suggest
>> problem applies to many other sites.
>>
>> CONCLUSION
>>
>> Bug exists in V 0.91 causing loss of transparency with PNGs when
>> uploaded to numerous websites especially Shopify; fully tested on
>> Shopify; proof being that earlier version test file works fine, but
>> when converted to a V 0.91 file, corruption appears.
>>
>> To manage notifications about this bug go to:
>> https://bugs.launchpad.net/inkscape/+bug/1551479/+subscriptions
>>
>
>
>
> --
> Confidentiality Warning: This message and any attachments are intended
> only for the use of the intended recipient(s)...

[Hachmann (marenhachmann)]

With regards to the solution of the problem, I'm marking this as a duplicate of the known linked opacity bug.