Question

I use php imagecolorallocate() and imagefill() in an image upload to also let png files have a white background (like in this post: imagescreatetruecolor with a white background)

Here is the part of the code it concerns:

    //create new images
    $nimgac_0=imagecreatetruecolor($maxw_img0,$maxh_img0); //img1
    $nimgac_1=imagecreatetruecolor($maxw_img1,$maxh_img1); //img2
    $nimgac_2=imagecreatetruecolor($maxw_img2,$maxh_img2); //img3

    $nimgaa_0=imagecolorallocate($nimgac_0,255,255,255);
    $nimgaa_1=imagecolorallocate($nimgac_1,255,255,255);
    $nimgaa_2=imagecolorallocate($nimgac_2,255,255,255);

    $nimga_0=imagefill($nimgac_0,0,0,$nimgaa_0);
    $nimga_1=imagefill($nimgac_1,0,0,$nimgaa_1);
    $nimga_2=imagefill($nimgac_2,0,0,$nimgaa_2);

    //create images from temp folder
        if ($type=="jpg") {
            $nimgb_0=imagecreatefromjpeg("../imga/".$_FILES['file']['name']);
            $nimgb_1=imagecreatefromjpeg("../imga/".$_FILES['file']['name']);
            $nimgb_2=imagecreatefromjpeg("../imga/".$_FILES['file']['name']);
        }

        if ($type=="png") {
            $nimgb_0=imagecreatefrompng("../imga/".$_FILES['file']['name']);
            $nimgb_1=imagecreatefrompng("../imga/".$_FILES['file']['name']);
            $nimgb_2=imagecreatefrompng("../imga/".$_FILES['file']['name']);
        }


    imagecopyresized($nimga_0,$nimgb_0,0,0,0,0,$nwidth_0,$nheight_0,$width,$height);
    imagecopyresized($nimga_1,$nimgb_1,0,0,0,0,$nwidth_1,$nheight_1,$width,$height);
    imagecopyresized($nimga_2,$nimgb_2,0,0,0,0,$nwidth_2,$nheight_2,$width,$height);

    imagejpeg($nimga_0,"../imga/".$_FILES['file']['name'],80);
    imagejpeg($nimga_1,"../imga/".$imgname_1,80);
    imagejpeg($nimga_2,"../imga/".$imgname_2,80);

but I get this warnings:

Warning: imagecopyresized() expects parameter 1 to be resource,
boolean given in … on line 114

Warning: imagecopyresized() expects parameter 1 to be resource,
boolean given in … on line 115

Warning: imagecopyresized() expects parameter 1 to be resource,
boolean given in … on line 116

Warning: imagejpeg() expects parameter 1 to be resource, boolean given
in … on line 117

Warning: imagejpeg() expects parameter 1 to be resource, boolean given
in … on line 118

Warning: imagejpeg() expects parameter 1 to be resource, boolean given
in … on line 119

Warning: imagedestroy() expects parameter 1 to be resource, boolean
given in … on line 120

Warning: imagedestroy() expects parameter 1 to be resource, boolean
given … on line 121

Warning: imagedestroy() expects parameter 1 to be resource, boolean
given in … on line 122

Same code without the immagecolorallocate() and imagefill() works perfectly fine. However, I cannot find any error or any difference to the above posted code.

Anyone any ideas? Thank you in advance!

PS: I want to save all images as jpg, that’s why I convert pngs to jpg too.

EDIT 3 (sorry, I got confused):

print_r(getimagesize($_FILES['file']['tmp_name'])); returns

Array ( [0] => 354 [1] => 332 [2] => 2 [3] => width=”354″ height=”332″ [bits] => 8 [channels] => 3 [mime] => image/jpeg )

so, everything is fine with if($size['2']==3) {$type="jpg";}…

Answer 1

I have finally found the answer to my problem and thought I should post it here step by step so if someone should have the same problem one day, here is what I figured out:

Basically, I had $nimga_0=imagefill($nimgac_0,0,0,$nimgaa_0); in my code, whereas imagefill is a bool. So, imagefill was successful and I assigned its value 1 to $nimga_0, and then wanted to use 1 as a resource in imagecopyresized($nimga_0,$nimgb_0,0,0,0,0,$nwidth_0,$nheight_0,$width,$height);.

Of course, this cannot be a valid source. All I had to change was leaving out the vars and just do:

imagefill($nimgac_0,0,0,$nimgaa_0);

---

STEP BY STEP

I created a canvas with

$nimgac_0=imagecreatetruecolor($maxw_img0,$maxh_img0);

then the white color with

$nimgaa_0=imagecolorallocate($nimgac_0,255,255,255);

and then just had to fill the canvas with the color using

imagefill($nimgac_0,0,0,$nimgaa_0);

Then I copy the uploaded image with

$nimgb_0=imagecreatefromjpeg("../imga/".$_FILES['file']['name']);

then copy the uploaded image onto the (now white colored) canvas

imagecopyresized($nimgac_0,$nimgb_0,0,0,0,0,$nwidth_0,$nheight_0,$width,$height);

and save as jpg

imagejpeg($nimgac_0,"../imga/".$_FILES['file']['name'],80); 

and finally clear the cache

imagedestroy($nimgac_0);

Hope it helps someone else too 🙂