Multi-page PDF

[watson]

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MagickEchoImagesBlob($w);

is your problem; you used MagickEchoImageSBlob() instead of MagickEchoImageBlob() (no "s"). The former echoes the MagickWand's blob, while the latter echoes the blob of the current active image in the MagickWand.

In the MagickWand API, if you set a MagickWand's image format, when you retrieve the MagickWand's blob (or write it), the operation obeys the rules of that format.

If the MagickWand contains multiple images, and you set the MagickWand's format to a multi-frame image capable format (like GIF or PDF), then all the frames are echoed/written as the multi-frame image; if however, the format is not multi-frame image capable (like JPEG), then the first image in the MagickWand is echoed/written.

Instead of setting individual image atributes, and retrieving the individual Images, you have set the MagickWand's attributes, and retrieved the MagickWand's blob.

Change

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MagickSetFormat($w, 'JPG');

to

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MagickSetImageFormat($w, 'JPG');

and change

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MagickEchoImagesBlob($w);

to

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MagickEchoImageBlob($w);

Post your results.

[watson]

If you are seeking to control how PDF (and all vector formats for that matter) are rendered/rasterized, then

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MagickSetResolution($wnd, $x_res, $y_res);
MagickSetSize($wnd, $img_w, $img_h);

are what you are looking for.

Call the above BEFORE reading in the image with MagickReadImage() and its ilk.