Watermarking on generated image renditions.
I followed this documentation https://docs.adobe.com/docs/en/aem/6-1/administer/content/assets/watermarking.html to achieve text watermark on the images, but it didnt yield the desired result.
Following exception occured in the error log
17.11.2015 13:23:15.802 *ERROR* [JobHandler: /etc/workflow/instances/server0/2015-11-17/model_15091680699364:/content/dam/ttnd/banner.png/jcr:content/renditions/original] com.day.cq.dam.core.process.WaterMarkProcess execute: error while watermarking asset; work item [VolatileWorkItem_node15_etc_workflow_instances_server0_2015-11-17_model_15091680699364]:
com.day.cq.dam.commons.watermark.WatermarkingException: java.io.FileNotFoundException: /tmpwm.png (Permission denied)
at com.day.cq.dam.core.process.WaterMarkProcess.execute(WaterMarkProcess.java:142)
at com.day.cq.workflow.compatibility.CQWorkflowProcessRunner.execute(CQWorkflowProcessRunner.java:93)
at com.adobe.granite.workflow.core.job.HandlerBase.executeProcess(HandlerBase.java:184)
at com.adobe.granite.workflow.core.job.JobHandler.process(JobHandler.java:232)
at org.apache.sling.event.impl.jobs.JobConsumerManager$JobConsumerWrapper.process(JobConsumerManager.java:512)
at org.apache.sling.event.impl.jobs.queues.JobRunner.run(JobRunner.java:205)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
please help !