[BUG] Crop pdf to png

[Durgeshwar-AI]

🐛 Bug Description

The pdf to png includes croping the png when creating the png. But at present the cropping causes the image to scale down a lot for some reason. The feature needs a fix so that the scalling down does not happen and the original size of the image is maintained.

[NikithaDineshKumar]

Hey @Durgeshwar-AI, I'd love to work on this! Could you please assign this issue to me?
The downscaling issue usually happens because the target canvas dimensions aren't matching the cropped coordinates 1:1, or a rendering transformation matrix is shrinking the output.

Here is how I plan to approach the fix:

🛠️ Proposed Fix Steps
Verify Coordinate Mapping: Check that the crop coordinates (X, Y, Width, Height) are calculated using the PDF's actual source resolution (DPI) rather than the viewport or display dimensions.

Match Target Canvas Dimensions: When extracting the cropped area, explicitly update the target canvas's physical width and height properties to precisely match the width and height of the cropped bounding box.

Check the Drawing Context (drawImage): Verify that the source parameters and destination parameters map 1:1 in the rendering context to prevent any accidental scaling or stretching during the draw phase.

Preserve Rendering Scale: If the PDF-to-image library is utilizing a specific render scale factor for high quality, ensure this scale factor is consistently maintained both before and after the crop so that pixel density remains uniform.

[NikithaDineshKumar]

/assign