Php – TCPDF image resize

image resizingpdfPHPtcpdf

I want to crate pdf with the leatest TCPDF.
I have an LC6 landscape document (152mm × 109mm). I put an image to the page, and set the image parameters like this:

$pdf->Image($image, 0, 0, 152, 0, 'PNG', '', '', true, 300);

The pdf file is empty. But, when I change 152 to 151, the image is appear in the pdf file, but smaller then the document.
Why disappear the image when it has enough space?
My picture is 1795×1287px but its doesn't matter because I want to resize it.

Update:
This problem doesn't occur with every picture, in other picture is appear correctly in pdf. The two images has same dpi and same resolution. Could be the source of problem the transparency?

Best Answer

Problem is solved.
The cache folder must be writeable. Unfortunately I have not found this information in the documentation, I have found it in the source code, in some images parser method's comment.

Related Solutions

Convert PDF to image with high resolution

It appears that the following works:

convert           \
   -verbose       \
   -density 150   \
   -trim          \
    test.pdf      \
   -quality 100   \
   -flatten       \
   -sharpen 0x1.0 \
    24-18.jpg

It results in the left image. Compare this to the result of my original command (the image on the right):

(To really see and appreciate the differences between the two, right-click on each and select "Open Image in New Tab...".)

Also keep the following facts in mind:

The worse, blurry image on the right has a file size of 1.941.702 Bytes (1.85 MByte). Its resolution is 3060x3960 pixels, using 16-bit RGB color space.
The better, sharp image on the left has a file size of 337.879 Bytes (330 kByte). Its resolution is 758x996 pixels, using 8-bit Gray color space.

So, no need to resize; add the -density flag. The density value 150 is weird -- trying a range of values results in a worse looking image in both directions!

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