Resizing images on download APEX XE

Hello

I want to re-size of the images that are uploaded through a download process in my application. Is this possible?

ordimage. Process is not available in Oracle XE.


I'd appreciate any help.


Concerning

Dominic

Maguzzi wrote:

I checked the suggested links. My application is hosted in a shared environment, so my privileges are limited.

I managed to prevent the download of images > to a size specified by checking HTMLDB_APPLICATION_FILES. DOC_SIZE.

Is there a way I can check the Dimensions (width and height). ?

I copy the details of the Image (FILENAME, FILE_OBJECT_ID, BLOB_CONTENT, etc.) of HTMLDB_APPLICATION_FILES to the MAG_IMAGES table in the download process. The following code works perfectly (if the record is not removed from HTMLDB_APPLICATION_FILES)

SELECT ''

of mag_images;

I'm assuming that the file_object_id is the location of the BLOB the BLOB HTMLDB_APPLICATION_FILES object?

What is actually in the file_object_id? The location of the BLOB? ,

This just seems to be long around in circles. As another poster of the latter, you jumping from a question of XY to try another to get instant results vaguely defined rather explaining the requirements in a way that would lead to a solution complete. If you have provided:

  • A full description of your environment, including the restrictions imposed by the hosting provider.
  • Some information about the application and requirements: what it does; how he uses images; the number of images concerned; the necessary formats/quality of image etc.

It would greatly help us to understand your problems and to identify the best overall solution.

Start with, I've created a little demo app in your workspace on apex.oracle.com, which demonstrates how it is simple declarative use of BLOB support to download and display images. This includes:

  • Page 1: home page [now] CSS slideshow based on a classic report with a model custom. I started the evaluation and experimentation with CSS slideshows only as your current slide show implementation is a little rough on the sides of the client and the server. (It is a work-in-progress as the demo code is excessively complex and unsuitable for the implementation by their SUMMIT. "I'll try to look at the improvements/alternatives in the next few days).
  • Page 2: Interactive report on recorded images and metadata, which demonstrates:
    • Declarative online display images using the mask of BLOB format
    • Display of images to aid online procedureapex_util.get_blob_file_src
    • Declarative added column links to images to helpapex_util.get_blob_file_src
    • Change the display size and the appearance of images in report using CSS
  • Page 3: Form on the table of the image, which shows:
    • Upload image file in a custom table using declarative BLOB
    • Showing a small version of the image by using a part of the Image display
    • Adding a contextual overview of the image using a dynamic action and the Fancybox jQuery plugin

I hope that this will get your application to use the built-in support of BLOB properly end-to-end and remove the dependency on APEX_APPLICATION_IMAGES. From this base, it should be much easier to move forward on the most advanced image, manipulation of subjects.

For viewing the image as above is so simple and effective and eliminates the need for re-sizing of images and changing the dimensions etc...

It may seem simple, but it is not effective and does not eliminate the need for resizing and the treatment of the uploaded images. All that (and the CSS method in my demonstration) is to specify the dimensions of the image that should be used when it is displayed in the browser. The entire image file is always downloaded, and the browser must perform operations by intensive calculation to resize to the specified dimensions. If you store images as 1280 × 960 1 MB JPEGs and have a report that shows 10 images per page as 128 × 96 presents a preview using a CSS rule, and then you will always download 10 MB of image per page view information, more of which is lost in the scaling. If you had 128 × 96 photos stored on the server, then the report could ask those and reduce the download size of 90%.

Resize/resample the images on the server allows image-intensive applications optimize their use of bandwidth by downloading the files different image according to the size and/or the quality required for different purposes.

Tags: Database

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