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brinley / jSignature

jQuery plugin for adding web signature functionality
http://www.unbolt.net/jSignature
694 stars 530 forks source link

Image background always black #39

Closed jmcmurray closed 11 years ago

jmcmurray commented 11 years ago

Hello,

I'm really liking jSignature and it seems to be working on several mobile devices I need to support. I am having one issue though, I need to save the signature as a jpg image on the server side. I've been able to get the PNG and convert it to JPG but my backgroud is always black rather than white. I've tried setting the back ground on the div, in css and as an option for jSignature but the background always appears black in the final output. I even tried getting the signature directly from the canvas so it was using the same code I used with another canvas control, but still no luck. Any ideas?

Thanks in advance, James

brinley commented 11 years ago

The png generated from jSignature has a transparent background, the settings set the background via css of the canvas element and isnt' saved with the png image. The black background is probably caused by whatever you use to convert to JPG as jpegs dont do transparent background. Perhaps check if your tool can handle the transparency background or convert the background to a solid color before conversion.

Regards, Brinley

On Thu, Aug 29, 2013 at 1:15 PM, jmcmurray notifications@github.com wrote:

Hello,

I'm really liking jSignature and it seems to be working on several mobile devices I need to support. I am having one issue though, I need to save the signature as a jpg image on the server side. I've been able to get the PNG and convert it to JPG but my backgroud is always black rather than white. I've tried setting the back ground on the div, in css and as an option for jSignature but the background always appears black in the final output. I even tried getting the signature directly from the canvas so it was using the same code I used with another canvas control, but still no luck. Any ideas?

Thanks in advance, James

— Reply to this email directly or view it on GitHubhttps://github.com/brinley/jSignature/issues/39 .

jmcmurray commented 11 years ago

Hey Brinley,

Thank you for the quick response. Changing the background color as you suggested worked perfectly.

Thanks again, James

From: Brinley Ang [mailto:notifications@github.com] Sent: Thursday, August 29, 2013 5:08 PM To: brinley/jSignature Cc: McMurray, James W Subject: Re: [jSignature] Image background always black (#39)

The png generated from jSignature has a transparent background, the settings set the background via css of the canvas element and isnt' saved with the png image. The black background is probably caused by whatever you use to convert to JPG as jpegs dont do transparent background. Perhaps check if your tool can handle the transparency background or convert the background to a solid color before conversion.

Regards, Brinley

On Thu, Aug 29, 2013 at 1:15 PM, jmcmurray notifications@github.com<mailto:notifications@github.com> wrote:

Hello,

I'm really liking jSignature and it seems to be working on several mobile devices I need to support. I am having one issue though, I need to save the signature as a jpg image on the server side. I've been able to get the PNG and convert it to JPG but my backgroud is always black rather than white. I've tried setting the back ground on the div, in css and as an option for jSignature but the background always appears black in the final output. I even tried getting the signature directly from the canvas so it was using the same code I used with another canvas control, but still no luck. Any ideas?

Thanks in advance, James

— Reply to this email directly or view it on GitHubhttps://github.com/brinley/jSignature/issues/39 .

— Reply to this email directly or view it on GitHubhttps://github.com/brinley/jSignature/issues/39#issuecomment-23523698.

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