I am working on a website in which the client wishes to have users upload background images to a printable design, crop to size, add text. Do this to multiple pages then generate a pdf of the 'book'
I am running into the following issues/questions and just need to see where I can start
Are there any PHP developer packages that can do something similar. I have seen jquery crop tools but something also for adding text to an image?
How would I keep the resolution up? If the final cropped with text image needs to be 150dpi, when cropping I am guessing I would have them working on a 72dpi image, then somehow apply the crop and changes to the large image?
If the resolution issue wasn't a big deal I would go about it this way:
Simple image upload
Use jquery to crop photo to correct dimensions
Mess around with gdlibrary and imagettftext() to get the text onto an image (page)
Use something like FPDF to create a pdf from each 'page'
Is this the right way to go about it and any thoughts on the resolution issue. Thank you for any help!
Your primary tool should be ImageMagick. ImageMagick can do the cropping, resizing, scaling, overlay text or graphics, combining images, and apply special effects. A big advantage of using a separate tool instead of PHP's image manipulation tools is that you can do the same transforms in batch through other mechanisms, or even hand the work over to another server to keep the website more responsive. And if you do want to integrate it tightly into the website, you can use the MagickWand For PHP interface.
Cropping does not change DPI, only the dimensions of the image. Scaling, on the other hand, changed both.
You should take a look at Gallery, a GPLed program with some of the functionality you're looking for, and written in PHP.
domPDF is a good tool for converting HTML to a PDF. this way you can use the image they upload as a background image, then put the text over it in any standard HTML tag.
As far as the resolution/dpi issue goes, I'm not sure if there is much you can do outside of changing the size of the image. I would recommend looking into This PHP Library, which has a lot of good tools for manipulating images.
I think with a combination of these tools, you'll be able to create HTML that can make a PDF that's fit to print, and use that.
Related
I'm building a web application that needs to be able to crop an image based on the location of a 4-sided shape with a white border (and no fill) contained in the image. All images uploaded by users are going to be dark so they shouldn't interfere with the algorithm to find the bounding box. This part of the application should be able to handle all types of quadrilaterals and will stretch whatever is contained within the white-bordered shape to fit a square.
My lazy rendition in Photoshop: http://i.stack.imgur.com/xJjoL.png
I'm using Laravel to build this application (LAMP stack). I'm looking at libraries such as ImageMagick and GD but I'm still new to programatically editing images. Are there specific functions in IM or GD that I could call to help me build this part of the application? Are there better PHP libraries that have the ability to do this? I'm not asking for code necessarily; I just want to know what tools I should start with before I build this.
Imagemagick can be used for this type of application if I understand what you're asking. To change the perspective of an image, look into:
http://www.imagemagick.org/Usage/distorts/#perspective
To crop images after distorting, look into:
http://www.imagemagick.org/Usage/crop/#crop
It would be easy to make a bash loop to accomplish these two tasks. Something like this:
## first distort the images
for i in *.jpg ##or whatever format you have (.tiff, pdf, etc..)
do
convert $i -distort Perspective out_file.png ## where you give coordinates into the perspective method
done
## now to crop the distorted images
for i in *.png
do
convert $i -crop out_file.jpg ## where you give the coordinates of the new rectangle to the crop method
done
The code above is just a STARTING point and would need to be populated according to the links I mentioned above. Happy scripting!
You may want to look into OpenCV for recognizing the rectagle. GD and image magic are good at editing images using filters, but they don't do a lot (or any?) of object detection.
See: https://github.com/ProGM/OpenCV-for-PHP/wiki/Installation-guide
I am looking to create a small app that allows a user to create a custom cover for a book. The client doesn't want to just be supplied with what the customer selected but a print ready 300dpi JPEG or PDF.
I know PHP can handle most of this. But the customisation seems to be a bit difficult to get right. I have tried using canvas to create the client side preview, which work ok enough.
Just to see if I'm wasting time trying to recreate the wheel, does anyone know if something like what I need exists already?
Basically it would be something kind of similiar to this but for creating print ready images.
Thanks!
If you're using Canvas for building the editor, for the best results, I'd recommend you re-render the customization on the server using whatever technology fits your need in PHP and not try to take the image they're looking at and make it work somehow by sending it to the server. The DPI will be wrong if you use Canvas in a standard way (it will be at the screen DPI).
For example, if they have the ability to place an image, then just note the coordinates and place the image in a web server created image at 300 DPI. Text, same thing, etc. Yes, it will be extra work, but it should be of higher quality and better consistency.
This would imply that there's a simple serialization format for the representation of the custom cover that is sent to the web server.
You might be able to use SVG, but you'll have to introduce a reliable SVG to PDF conversion and handle fonts. Maybe something like this? (I'm not sure that building an SVG editor would be easier than Canvas based).
Starting from your "work ok enough preview", jsPDF will be able to generate a PDF right from the browser in a breez.
convert the canvas to a image/jpeg (toDataURL will be your best friend)
instanciate a jsPDF object, add the image
output the jsPDF object
Tricky details:
beware your screen displays stuff with 72dpi but print expect 300dpi. So you can up scale your canvas then draw the image within the pdf PDF
beware to Cross Origin Resources: if you are using images outside your domain, you are doomed (or you will need a proxy)
I am trying to make project of a web app that will check the colour of the PDF document. My preferred language is PHP.
At the begining I've been thinking about GD, but this only refer to images (jpg, png, gif). Nothing for PDF. For images I am going to use some method similar to this: Get image color.
So does anyone know some method, library (opensource), or something else to make such app? I can't find any examples on the web.
You'll probably be best off converting the PDF into an image, and then using the same method you're using for images. In addition to being easy to do, that will also guarantee consistent results.
However, converting a PDF file to an image is not something that PHP alone is well-equipped to do. The best way to go is the ImageMagick based approach as described in this question. It gives a number of alternatives, too.
I'd like to know which up-and-crop tools you suggest to me. I tried couple of scripts like JCrop but I always get stack with some type of format like bmp. I either can't upload or I can upload but can't crop. If you use (or know) one that works well with different formats, then please just give me its name and I'll be strongly appreciated!
Well, i dont know much about JCrop but you can build it up with several tools.
I think image processing kind of works should be done on server side.
There is a good OOP Library called Imagine. It's mostly based on Python's Imaging Library which is awesome and has decent documentation. And this is its crop functions documentation.
On client side you can use some kind of image area selection tool to let the user determine desired area to crop. imgAreaSelect is good to go. Then you can send crop area to php by JQuery's post function or any other way.
It's amassing that in all this time this haven't got any other answers, I hope this helps.
Like stated in the other answer you should combine a few tools to solve each part of the problem.
To let the user select the cropping area:
If you don't like jCrop you can try Guillotine. It's very lightweight, easy to set up and allows to crop, zoom and rotate images. It has touch support and it's responsive (fluid).
Keep in mind that you can't display image types that the browser doesn't support, but you can convert them in step 3.
To upload the images:
For most cases, once you have the cropping area, with a simple file input will suffice.
Now, if you want to upload files asynchronously check out
this
for a quick and easy set up or this
for a more complex solution.
To actually crop and process the image:
Once uploaded you can crop, convert and process the images on the server, ImageMagick is a great tool for this. It's Open Source and many languages have wrappers for it.
You've tagged the question with PHP so here is a PHP wrapper for ImageMagick.
I am looking for a decent image cropping solution, ideally a script that would do the following :
Allow to upload an image (ideally via ajax), crop the image using some jQuery like cropping tool and then save the 'new' cropped image while retaining the image untouched.
Is there anything people could recommend?
Use Pixastic for client-side image processing.
Edit
It sounds like you might be looking for an image crop GUI for users, rather than a way to programmatically crop images (as I read your question originally). In that case, there are a variety of jQuery plugins that provide this; jrac seems to be a reasonably up-to-date one.
you can check here it is good tool
http://deepliquid.com/content/Jcrop_Download.html