DAM- OOTB Workflow not creating Renditions properly

[bhavanij5467840]

When i upload a 1200x907 image using the OOTB image upload workflow, it created the following renditions. 

cq5dam.thumbnail.48.48.png

 cq5dam.thumbnail.140.100.png

cq5dam.thumbnail.319.319.png

cq5dam.web.1280.1280.jpeg

But the 1280.1280 rendition was not actually 1280.1280 but 1200.907 which is the actual size of image

Similarly when i upload an image of 2000x650 the rendition of 1280x1280 is actually 1280x416px. 

When i upload a 160x160 image the 1280x 1280 rendition is actually 160x160 only. if failed to generate the 1280x1280

Is there a way i can generate a 1280x1280 image from 2000x650 image? Similarly how can i generate a 720 x flexible - rendition. Also similarly how do i generate large rendition of small images?

What are the limitations of the out of the box workflows and Thumbnail generator. 

[edubey · Accepted solution]

Here are couple of usefful links:-

• http://www.albinsblog.com/2015/04/how-to-create-different-image-renditions-in-adobecq5.html#.Vclvv_m...
• http://adobe-consulting-services.github.io/acs-aem-commons/features/dam-workflow-processes.html
• http://docs.adobe.com/content/docs/en/aem/6-0/develop/ref/javadoc/com/day/cq/dam/api/renditions/Rend... - API

Media Handlers given by AEM: https://docs.adobe.com/docs/en/cq/5-6-1/dam/dam_media_handlers.html

[bhavanij5467840]

i am using AEM 6.0 and none of the above links seem useful for my purpose. Can it be a bug in AEM?