Unlock a PDF file?

hello !

i trying modify pdf file using photoshop , i'm failing completely.

i scanned b&w drawings (automatically transformed pdf files), when try edit them photoshop, background layer cannot unlocked, cannot create layer can draw on in black/grey/whites.

i tried:

exporting in different formats (png, jpg),

converting using online converters,

changed colour profile rgb

 

nothing working :/  appreciated !! thank

try this

from description, suspect may in indexed colour mode.

go image - mode - change rgb

then unlock layer right click on layer in layers panel , choose "layer background"

 

if not work post screen shot showing tab @ top of opened image

 

dave

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